MR750_扫描界面

合集下载

GE MR750 简介

Penetration Cabinet
Power Cabinet
MDP
New
Modified
Un-changed
Jan 2010 Rev 6
System Re-architecture Approach
Operator room – Discovery and Optima
Scan Room Display Converter*
Cryo Cooler
Cabinet I/O
CAM CAM
Cryo Cooler
Cryo Cooler
XG A
XG A
XG A
RF Amp*
Cooling Loop 1
Cooling Control
Scan Room PS**
XG A PS XG A PS XG A PS
MNS BB RF Amp*
Primary Display Host PC
SCIM
Intercom
MOD (no longer available)
Jan 2010 Rev 6
Same - a little more detail…
Equipment room
Term Block I/O XG A Cabinet I/O XPS Broadban d RF Amp Power Distribution PDU XPS XPS XG A XG A Cabinet I/O
Just touch and go
Volumetric vascular (run-off) scan
Jan 2010 Rev 6
The DV / DVMR / TNT / Data:
• • • • • • • • • • Scope – complete system change except magnet More than two times bigger than average MR programs More than 4500 parts (versus HDx 900 parts) 10,000 drawings Approximately 200 FRUs (versus HDx 125, VCT 120) More than 1,000 service documents Resource peak at nearly 400 Managed many technical risks New siting requirements, and design and training challenges Driving to new Reli standards; total systems view with proactive reli growth (reli budget of $1.8M + $600K P&E)

中国脑成像联盟首批临床科研型功能磁共振成像数据采集标准介绍

二、标准化参数的比较与测试
• 信噪比与成像线圈 • 多中心数据一致性验证－任务态fMRI • 多中心参数验证
信噪比与成像线圈
• 不同成像线圈比较 • BOLD图像信噪比 • DTI图像信噪比
不同成像线圈比较
MR 750
Prisma
BOLD图像信噪比
Noise
信噪比测量示意图
Noise
123 - 155 mm 136.96± 5.03 mm
磁共振多模态标准化扫描参数
• T1(3D)扫描参数 • BOLD扫描参数 • DTI扫描参数 • 场图(field map)扫描参数 • T2(3D)扫描参数
T1(3D)高分辨率结构像
T1(3D)扫描参数
Scanner Sequence FOV (mm2) SliceThickness (mm) Gap (mm) SliceNum. TR (ms) TE (ms)
TR (ms) TE (ms) Phase partial Fourier Matrix PhaseDir. iPAT/Aset b0 Num. b (s/mm2) b Num. BandWidth VoxelSize (mm3)
Coil TA
Prisma
8000 64 6/8
2/24 10 64 2030 Hz/px 64CH/20CH 10m18s
Coil Scans
TA
Prisma
MR 750
2368 Hz/px 250 KHz
64CH/20CH 8CH/32CH
8m6s
8m
Ingenia
Trio Tim
224 × 224
3.5
0.7
33
Interleaved

3D Bravo、3D Cube Flair两种MR增强扫描序列用于肺癌脑转移病灶的检验能力比较

64·罕少疾病杂志 2022年06月第29卷第 6 期总第155期【第一作者】李　艳，女，技师，主要研究方向：磁共振。

E-mail：********************【通讯作者】李　艳·论著·3D Bravo、3D Cube Flair两种MR增强扫描序列用于肺癌脑转移病灶的检验能力比较李艳*安阳市人民医院医学影像科 (河南安阳 455000)【摘要】目的探讨3D Bravo、3D Cube Flair两种MR增强扫描序列用于肺癌脑转移病灶的检验能力。

方法选择我院肿瘤科2016年1月至2020年1月期间收治100例肺癌脑转移病灶患者为研究对象，全部观察对象均分别接受本研究方案的MR增强扫描，对比两组检查技术的检出情况、判读结果和信号强度。

结果 3D Bravo MR增强扫描对于脑膜转移和脑内转移的临床检出率均明显高于3D Cube Flair MR增强扫描，两种方法病灶部位检出数据对比差异具有统计学意义(P <0.05)，3D Bravo序列检出率为93.2%，漏诊率6.8%，误诊率为0.4%，3D Cube Flair序列检出率96.8%，漏诊率3.2%，误诊率为1.4%，数据分析结果比较差异具有统计学意义(P <0.05)，两种序列的图像质量都比较理想，但部分患者可见伪影情况，3D Bravo和3D Cube Flair序列图像测量的信号强度CR 符合正态性分布特征，但两者病灶与正常灰质、病灶与正常白质的信号强度对比差异具有统计学意义(P <0.05)。

结论 3D Cube Flair序列MR增强扫描用于肺癌脑转移病灶的检查和诊断，应用效果较好，但3D Bravo与3D Cube Flair序列联合应用能够提高检查的可靠性。

【关键词】3D Bravo序列；3D Cube Flair序列；MR增强扫描；肺癌脑转移病灶【中图分类号】R814.43【文献标识码】ADOI:10.3969/j.issn.1009-3257.2022.06.023Comparison of 3D Bravo and 3D Cube Flair Enhanced MR Sequences in Detecting Brain Metastases from Lung CancerLI Yan *.Department of Medical Imaging, Anyang People's Hospital, Anyang 455000, Henan Province, ChinaAbstract: Objective To evaluate the ability of 3D Bravo and 3D cube flair enhanced MR sequences in detecting brain metastases from lung cancer. Methodsfrom January 2016 to January 2020, 100 patients with brain metastases from lung cancer in our hospital were selected as the research objects. All the observation objects received the enhanced MR scanning of this research scheme. The detection, interpretation results and signal intensity of the two groups were compared. Results MR scan was significantly higher than that in 3D cube flair enhanced MR scan, and the difference was statistically significant (P <0.05). The detection rate of 3D Bravo sequence was 93.2%, the missed diagnosis rate was 6.8%, the misdiagnosis rate was 0.4%, the detection rate of 3D cube FLAIR sequence was 96.8%, the missed diagnosis rate was 3.2%, and the misdiagnosis rate was 1.4%, The difference of data analysis results was statistically significant (P <0.05). The image quality of the two sequences was ideal, but artifacts could be seen in some patients. The signal intensity CR measured by 3D Bravo and 3D cube flair sequences was consistent with the normal distribution characteristics, but the lesions of the two sequences were similar to those of normal gray matter and gray matter There was significant difference in signal intensity between lesions and normal white matter (P <0.05). Conclusion 3D cube FLAIR sequence enhanced MR scanning has a good effect in the detection and diagnosis of brain metastases of lung cancer, but 3D Bravo combined with 3D cube FLAIR sequence can improve the reliability of the examination.Keywords: 3D Bravo Sequence; 3D Cube FLAIR Sequence; Contrast Enhanced MR Scan; Brain Metastases of Lung Cancer 肺癌是一种临床上较为常见的恶性肿瘤疾病，且晚期肺癌患者存在较高的远处转移风险，这也会直接增加患者的死亡风险，并对其预后造成不良影响。

GE型号MR产品使用指南说明书

INTRODUCTIONThese magnetic resonance (MR) protocols were developed by an expert consensus panel for use on General Electric (GE) MR imaging machines, and were developed for high-end platform scanners with multichannel phased array coils and parallel reconstruction capabilities. The protocols are divided into 3 sections:•Body MR imaging•Body MR angiography•Central nervous system (CNS) MR imagingThe protocol parameters can generally be adapted to work with other software platforms or releases and hardware configurations but may require small modifications that can be made by a knowledgeable and experienced MR technologist. Scan times may increase in some circumstances.These protocols provide field strength–specific parameters for 1.5T and 3T. Attention has also been given to patient preparation, streamlining the exam, and making the best use of contrast material, whether it is a standard gadolinium-based extracellular fluid agent, a high-relaxivity gadolinium-based contrast agent (GBCA), such as MultiHance® (gadobenate dimeglumine [Gd-BOPTA]), or agents with hepatobiliary uptake such as Eovist®(gadoxetic acid) and MultiHance®.Each protocol contains a brief description of patient preparation, special notes on coil choice and placement, suggestions for contrast dose and administration rate, and suggestions concerning timing of fluoroscopic triggering, if appropriate.The consensus panel consisted of the following experts in radiology:Thomas Grist, MD University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin Mark C. DeLano, MD ̶ Michigan State University, Advanced Radiology Services, PC, Grand Rapids, Michigan Scott B. Reeder, MD, PhD ̶ University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin Howard A. Rowley, MD ̶ University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin Steffen Sammet, MD, PhD, DABR, DABMRS, FAMP ̶ The University of Chicago Medical Center, Chicago, Illinois Megan E. Vadnais, BSRT, (R)(MR) ̶ University of Wisconsin School of Medicine and Public Health, Madison, WisconsinDisclaimerThe content and views presented in this educational activity are those of the authors and do not necessarily reflect those of Medical Education Resources, ABC Medical Education, and/or Bracco Diagnostics Inc. The authors have disclosed if there is any discussion of published and/or investigational uses of agents that are not indicated by the US Food and Drug Administration (FDA) in their presentations. The protocols presented here were developed for pediatric and adult patients of average weight.Before prescribing any medicine, primary references and the full prescribing information for each product should be consulted. Any procedures, medications, or other courses of diagnosis or treatment discussed or suggested in this activity should not be used by clinicians without evaluation of their patient’s conditions and possible contraindications or dangers in use, review of any applicable manufacturer’s product information, and comparison with recommendations of other authorities. The information presented in this activity is not meant to serve as a guideline for patient management.Off-Label StatementThis educational activity contains discussion of published and/or investigational uses of agents that are not on-label by the FDA. The opinions expressed in the educational activity are those of the faculty. Please refer to the official prescribing information for each product for discussion of approved indications, contraindications, and warnings. Further, participants should critically appraise the information presented and are encouraged to consult appropriate resources for any product or device mentioned in this activity.MR Protocols for Body MR ImagingContrast timing is extremely important for abdominal MR imaging, particularly for high-quality liver imaging. We recommend the use of fluoro-triggering or “SmartPrep” methods rather than the use of a timing bolus.All body MR imaging protocols presented here were developed by Scott B. Reeder, MD, PhD, Steffen Sammet, MD, PhD, DABR, DABMRS, FAMP, and Megan E. Vadnais, BSRT, (R)(MR) for 1.5T and 3T systems. Specific protocols include:•Abdomen‒ Generic Abdomen Pelvis 1.5T and 3T‒ Appendicitis Noncontrast 1.5T and 3T‒ MR Enterography 1.5T and 3T•Liver‒ Liver/Pancreas Extracellular Agent 1.5T and 3T‒ Liver/Pancreas Hepatobiliary Agent 1.5T and 3T‒ Magnetic Resonance Cholangiopancreatography (MRCP) Noncontrast 1.5T and 3T‒ Diffuse Liver Disease 1.5T and 3T•Pelvis‒ Generic Pelvis 1.5T and 3T‒ Female Pelvis Malignant 1.5T and 3T‒ Female Pelvis Benign 1.5T and 3T‒ Uterine Anomaly 1.5T and 3T‒ Rectal Cancer 1.5T and 3T‒ Perianal Fistula 1.5T and 3T‒ Prostate 1.5T and 3T•Adrenal and Renal‒ Adrenal 1.5T and 3T‒ Renal 1.5T and 3TGeneral Notes•Intravenous access should be obtained with an 18- to 22-gauge needle•We suggest the use of a contrast injector and a saline flush of a minimum of 20 to 30 mL at the same injection rate as the contrast injection (1.5-2.0 mL/sec)•Breath-holding is essential for good image quality for thoracic or abdominal MR imaging. Precontrast scans should be used to ensure that the patient can both breath-hold adequately and understand the instructions. We recommend breath-holding at end-expiration (end tidal volume)•When parallel imaging is used, care must be taken to increase the field of view sufficiently to avoid residual aliasing artifact. This is generally more often a problem for coronal imaging, which may require placing the arms over the head or elevating the arms by the patient’s side•In patients with renal failure, consider using a half-dose (0.05 mmol/kg) of a high-relaxivity Group II contrast agent such as MultiHance® (gadobenate dimeglumine), particularly at 3TMR Protocols for Body MR AngiographyAll protocols should use Fluoro-Triggered (FT) magnetic resonance (MR) angiography fluoroscopic imaging for bolus detection. MR imaging protocols for MR angiography presented here include 1.5T and 3T systems, and were developed by Thomas Grist, MD, and Megan E. Vadnais, BSRT, (R)(MR) for the following procedures:•Cardiac MRA–Cardiac Basic Anatomy and Function 1.5T and 3T–Pulmonary Artery 1.5T and 3T–Pulmonary Vein Mapping 1.5T and 3T•Thoracic MRA–Thoracic Aorta MRA 1.5T and 3T–Gated Thoracic Aorta 1.5T and 3T•Abdominal MRA–Contrast-enhanced MRA Abdomen 1.5T and 3T–Noncontrast-enhanced MRA Abdomen 1.5T and 3T–Thoracoabdominal Aortic Aneurysm MRA 1.5T and 3T•Peripheral MRA–Lower Extremity Contrast-enhanced MR Venography (CE MRV) 1.5T and 3T–Runoff Abdomen to Lower Extremity MRA 1.5T and 3T–Peripheral Runoff Noncontrast 1.5T and 3T–Arteriovenous Malformation (AVM) Evaluation 1.5T and 3TThe rationale for the patient preparation for contrast-enhanced MR angiography is based on a hypothetical generic patient. Individual protocols may include important variations and will be delineated in the specific protocol. General Notes•Intravenous access should be obtained with an 18- to 22-gauge needle, inserted preferably in the antecubital fossa. Right side is preferred (when possible) for thoracic or carotid MR angiography•Use respiratory bellows – gating parameters:–R-R intervals = 2-3–Trigger point = 40%–Trigger window = 30%–Delay = minimum•The basic sequences recommended are intended to achieve both anatomic localization and high-quality anatomic imaging to complement the angiographic sequences that are performed. These include:–3-plane localizer–Coronal single-shot fast spin-echo (FSE)–Axial T2 FSE (respiratory triggered)–3D (three-dimensional) contrast-enhanced MR angiography FT (precontrast-practice breath-hold)–3D contrast-enhanced MR angiography FT (postcontrast)–3D contrast-enhanced MR angiography FT (2nd postcontrast)–Axial fast spoiled gradient-echo postcontrast fat-saturated•A power injector is highly recommended with a minimum of 20- to 30-mL saline flush delivered at the same injection rate as the contrast injection•Breath-holding is critical to good image quality for thoracic or abdominal MR angiography. Precontrast or practice scans help ensure that the patient can both breath-hold adequately and understand the instructions•When parallel imaging is used, care must be taken to not have wraparound artifact on the vascular structures. This generally requires prescribing a large field of view beyond the body wall, and for abdominal imaging, it requires placing the arms over the head or elevating the arms at the patient’s side. When performing the calibration scan, overprescribe by one-fourth the area of interest in the superior and inferior directions to reduce scan cutoff. Calibration scans are performed in the axial plane MR Protocols for Central Nervous System (CNS) MR Imaging Newer hardware and software platforms at both 1.5T and 3T allow efficient protocol options for a wide range of CNS indications. This section suggests multiple consensus methods for optimizing examination of patients undergoing MR imaging in the CNS. Core sequences in each protocol are identified, and their aggregate use constitutes a complete examination for each protocol. Alternative sequences of interest are included for emerging technologies, specific target anatomy, or subspecialty preference.1.5T and 3T CNS MR imaging protocols presented here were developed by Howard A. Rowley, MD, Mark C. DeLano, MD, and Megan E. Vadnais, BSRT, (R)(MR) for the following procedures:•Brain–Routine Adult Brain 1.5T and 3T–Brain Neck Magnetic Resonance Angiography (MRA)/Magnetic Resonance Venography (MRV) 1.5T and 3T –Motion Brain 1.5T and 3T–Routine Stroke Fast 1.5T and 3T–Hyperacute Stroke Brain 1.5T and 3T–Tumor Brain 1.5T and 3T–Multiple Sclerosis Brain 1.5T and 3T–Pediatric Brain 1.5T and 3T–Epilepsy Brain 1.5T and 3T•Specialty Brain–Hydrocephalus Brain 1.5T and 3T–Cerebrospinal Fluid Flow 1.5T and 3T–Pituitary 1.5T and 3T–Cranial Nerves/Internal Auditory Canals 1.5T and 3T–Vessel Wall 1.5T and 3T•Head and Neck–Orbits 1.5T and 3T–Soft Tissue Neck 1.5T and 3T–Sinuses/Face 1.5T and 3T•Spine–Cervical Spine 1.5T and 3T–Lumbar Spine 1.5T and 3T–Thoracic Spine 1.5T and 3T–Routine Total Spine 1.5T and 3T–Focused Total Spine 1.5T and 3T–Specialty Spine 1.5T and 3T–Brachial Plexus 1.5T and 3T–Lumbar Plexus 1.5T and 3TGeneral CNS Protocol Notes•Standard brain. There are multiple approaches to obtain various tissue parameter weightings at both1.5T and 3T, such that “standard” imaging refers more to the general-purpose nature of the protocolrather than the core sequence choices. The core preferences of our consensus panel are indicated within each protocol•T1.Six techniques for obtaining T1-weighting are included: spin echo (SE), fast spin echo (FSE), T1 fluid-attenuated inversion recovery (T1-FLAIR), 3D IR-prepared FSPGR (BRAVO), 3D T1 CUBE, and magnetization transfer (MT)–SE is the T1 reference standard for image contrast at 1.5T, although the other sequences have unique advantages and are included as options. Due to T1 prolongation at 3T and associated loss of gray-white contrast there is no consensus standard for T1-weighting, and many sites use inversion recovery preparation to restore tissue contrast–FSE with its intrinsic magnetization transfer effects results in decreased gray-white contrast but may depict contrast enhancement to better advantage–T1-FLAIR and BRAVO are inversion prepared, facilitating excellent gray-white differentiation but with the potential disadvantage of inconspicuous contrast enhancement due to the marked precontrast hypointensity of many lesions and subsequent isointensity to surrounding brain postcontrast –BRAVO, as a standard 3D sequence, has the key advantage of multiplanar reconstruction capability of the isotropic data sets, and excellent gray-white contrast desirable for most applications –T1 CUBE. This T1-weighted FSE-based volumetric sequence can be performed either before or after contrast. Beyond the usual 3D attributes (such as high resolution and multiplanar reconstructions), it has particular advantages postcontrast, where it provides black blood imaging, supports fat saturation, and shows outstanding tissue contrast for enhancing lesions. T1 CUBE is suitable for routine brain imaging and also orbital, cranial nerve, and vessel wall imaging exams. Many sites now use T1 CUBE as a supplement to postcontrast T1 BRAVO and other sequences–MT is an optional feature that can be added to increase contrast enhancement conspicuity on SE imaging, but at the cost of increased SAR and decreased gray-white distinction•T2. Most sites use FSE sequences rather than SE. PROPELLER is effective for dealing with patient motion, and is the primary FSE sequence used at many sites. Some users add fat saturation to T2 imaging as an option•T2-FLAIR.Improves lesion detection particularly at the brain-CSF interface. When done as the first sequence postinjection, postcontrast T2-FLAIR imaging effectively inserts a time delay for subsequent T1-weighted scans, which improves lesion detection on subsequent T1 imaging. The T2-FLAIR images also have some intrinsic T1 contrast that allows visualization of both edema and enhancement on one sequence for many lesions. Both 2D and 3D T2-FLAIR sequences are commonly performed, with the advantage of multiplanar reconstruction capability and fewer CSF pulsation artifacts of the 3D CUBE •Susceptibility. Due to the reduced susceptibility weighting of FSE methods, a T2*-GRE sequence can be added as an option to detect blood products and calcium. The SWAN sequence has been shown to more sensitively detect subtle areas of blood and calcium and has become a common protocol choice•Diffusion. Most brain protocols include a diffusion-weighted imaging sequence that is useful for stroke, infection, and tumor imaging. Apparent diffusion coefficient maps should be included to assess T2 shine-through. In areas near the skull base or orbits, PROPELLER DWI can be a good option to reduce signal pile-up and geometric distortion artifacts•Perfusion. Dynamic susceptibility contrast, perfusion-weighted imaging is becoming increasingly important and can provide clinically significant information regarding blood volume and/or transit time for both stroke and tumor imaging. Arterial spin labeling is also an option for assessing cerebral blood flow at 3T, but must be obtained precontrast•Contrast. The protocols presented here do not list separate imaging sequences for postcontrast imaging; rather, the T1-weighted sequence of choice is typically repeated after contrast agent administration. Most neurologic sequences with contrast are acquired with at least a 3- to 5-minute delay after injection to optimize visualization of disorders of the blood-brain barrier. Some protocols use more than one sequence “family” postcontrast, such as T2-FLAIR, T1-BRAVO, and T1-CUBE Fat Sat due to their complementary information. Many centers prefer routinely acquiring such volumetric series postcontrast to facilitate retrospective multiplanar reconstructions, treatment planning, and neuronavigation applications. T2-FLAIR is an excellent complement to T1 series, and may be done first postcontrast to intentionally provide a time delay before the T1 series are acquired. The method of injection is not important in these cases, and manual injection is typically used. However, power injectors are needed for contrast-enhanced MR angiography and perfusion imaging. Rates of injection vary, but 4 to 5 mL/sec is standard for perfusion, and 1.5 to 2 mL/sec is used for MR angiography. Dosing is weight based and at 0.1 mmol/kg for most protocols aimed at standard extracellular fluid distribution. The dose for an individual injection may be lower for first-pass MRA or perfusion exams, where a split-dose protocol can often be used, keeping overall dose within the standard 0.1 mmol/kg guideline. The ACR has recommended that the lowest dose feasible be used for diagnostic purposes. Because standard dosing recommendations are mostly influenced by lean body mass, and ECF volume in fatty tissues is low, some sites cap the upper limit of contrast for heavier adults at 20 mL total, especially when a high-relaxivity agent is being used.A useful contrast dose calculator (“GadCalc”) is available at https:///contrastCorner/ gadcalc.php and is also available for free download at the Apple and Droid App Stores.。

MR扫描参数

HEAD： Sag T2 frFSE S
Series Mode Coil Imaging Options Echoes TE TR TI FA
M R(GE 1.5 Signa )扫描参数
FRFSE-XL 2D HEAD FC、VBw、TRF、Fast
1 102 3000
ETL BW Fov/Thk/S Freq*Phase
31.25 36/8.0/2.0 256*128
NEX Pfov FD FCD
1 0.75 R/L Autoshim
7
M R(GE 1.5 Signa )扫描参数
Cor T2 SSFSE
Series Mode Coil Imaging Options Echoes TE TR TI FA
SE 2D TPUPPER Fast、SS
ZIP512、ZIP2
1
NEX
Min mum
Pfov
340
FD
FCD
20
15.63 24/1.4/0/70 256*192
1 0.88 A/P
2
M R(GE 1.5 Signa )扫描参数
2D PRESS MRS
Series Mode Coil Imaging Options Echoes TE TR TI FA
1 90 2000
ETL BW Fov/Thk/Sp Freq*Phase
31.25 36/5.0/1.0 256*128
NEX Pfov FD FCD
1 1
Autoshim
MRCP SSFSE
Series Mode Coil Imaging Options Echoes TE TR TI FA
SE 2D TPUPPER VBw、Fast、SS

MR750_IDeal

*GE Healthcare Discovery MR750w 1Discovery MR750DISCOVERY MR750三点法非对称回波水脂分离成像IDeal, IterativeD ixon water-fat separation withE cho A symmetry and L east-squares estimatio*GE Healthcare Discovery MR750w三点法非对称回波水脂分离，IDeal水脂分离IDeal 成像•IDeal 成像基本原理•IDeal 高场磁共振技术应用优势•IDeal 脉冲序列常用扫描参数水脂分离与脂肪抑制的临床应用MR750IDEAL 水脂分离，一次扫描四种组织对比度。

DIXON与IDEAL水脂分离成像理论基础通用电气磁共振应用学院系列教材水脂分离成像原理：•DIXON，经典的两点法水脂分离技术。

•IDEAL，非对称回波三点法水脂分离。

1.相对于IR序列不影响纵向磁化2.对磁场不均匀的影响不敏感对称回波两点法水脂分离，DIXON3.相对于化学饱和法不受射频场均匀性的影响Delfaut, et al. Radiographics 1999;19:373-382通用电气磁共振应用学院系列教材三点法对称回波DIXON成像原理对称回波三点法DIXON成像特点：•水脂含量接近时分离得到的图像SNR非常差•水脂交界区域图像模糊、分离不完全说明：三点法对称回波采集时间点分别为（-2π/3，0，2π/3），水脂比例不同时，导致水脂分离不稳定或信号不稳定。

水信号分离准确性通用电气磁共振应用学院系列教材三点法非对称回波IDeal 成像原理非对称回波三点法IDealπ/2-π/67π/6成像特点：•非对称回波三点法成像采集信号的时间点偏移为 -π/6，π/2，7π/6，这种非对称的采集方式可以充分克服传统三点式DIXON方法的缺点，保证水脂分离的完全性和结构的清晰性。

惠普扫描仪使用手册

注意如果未显示安装对话框，请双击安装 CD 根目录下的 scanner.htm 文件。
2. 单击“查看或打印指南”。显示语言列表。
3. 单击您想使用的语言。显示指南列表。
4. 单击“屏幕显示的用户指南”。
按钮禁用实用程序
为避免无意中按下按钮，您可以使用“按钮禁用实用程序”以禁用按钮。您可以使用相同的实用程序重新启用按钮。
3 故障排除 ...................................................................................................16 扫描仪初始化或硬件问题 ..........................................................................16 扫描仪操作问题 ........................................................................................17 幻灯片、底片和 TMA 问题 .......................................................................20
前面板和附件概述
本部分概述了扫描仪前面板和透明材料适配器 (TMA)。 ● 前面板按钮 ● 透明材料适配器 (TMA)
前面板按钮
图标
功能名称扫描按钮
说明扫描图片、图形、文档或物体。
扫描胶片按钮扫描透明正片（例如 35 毫米幻灯片）和底片。扫描胶片需要使用扫描仪盖板下的透明材料适配器 (TMA)。
注意如果要在发送到目标位置之前预览扫描结果，请在 “HP 扫描”对话框中选择“显示预览”。另请参阅“预览扫描的图像”。

GE磁共振扫描操作界面介绍

2020/2/24
定位线复制后的效果
2 下载
1 接受、保存
3 扫描
26 / GE Title or job number /
2020/2/24
加饱和带
预置饱和主要用于消除扫描视野内或视野外的金属、运动伪影的影响。饱和带应尽量覆盖可能引入伪影的位置，避开感兴趣的部位。
27 / GE Title or job number /
2020/2/24
选择饱和带窗口
28 / GE Title or job number /
2020/2/24
1 选中饱和带位置
2 在图像上点鼠标左
键，出现饱和带
29 / GE Title or job number /
2020/2/24
调节饱和带厚度
旋转
30 / GE Title or job number /
示图……
增加层数
旋转角度
1 激活窗口中画定位线
，其它窗口调整位置
2 接受（可跳过）
3 保存
17 / GE Title or job number /
2020/2/24
如果需要改变定位指示
图……
2 点“选择序列”键
1 激活需要置换图像的视窗
18 / GE Title or job number /
2020/2/24
1 选择要替换上去的序列
2 如果仅替换一个视窗，选“OK”；如果替换所有视窗，GE
Title
or
job
19 number
/ /
2020/2/24
选择“OK ALL”
增加层数
1 激活窗口中画定位线
，其它窗口调整位置
2 接受（可跳过）

GE Discovery MR 750 3.0T磁共振故障的维修

医疗装备 2017年9月第30卷第17期 Medical Equipment, September. 2017,Vol. 30, No.17磁共振设备因其密度分辨力强，无放射线，对人体安全无害等特点，广泛应用于心脑血管疾病及癌症等重大疾病的早期诊断[1]。

GE Discovery MR 750的eDWI为临床提供的高信噪比、高分辨力肿瘤筛查方法，提高了临床诊断效率[2]。

在临床应用及科研工作中的广泛性及重要性日益显著。

在我院MR 750磁共振对于心脑血管疾病、癌症的研究和诊断方面起着至关重要的作用。

因MR 750属于高端复杂设备，在临床的应用过程中容易发生故障而影响正常使用，因此有必要分析故障[3]。

本研究重点介绍GE Discovery MR 750 3.0T磁共振的二例故障维修实例。

1 常见故障一故障现象：32通道体线圈扫描失败，体表线圈偏置电压报错。

报错内容：“Auto Prescan failed， RF Hub RF/bias setup not complete”“A multicoil bias fault was detected”。

故障分析：出现体表线圈偏置电压报错，导致体线圈扫描失败，可能引起的原因主要有：（1）体线圈通道板故障[4]；（2）连接头故障；（3）系统故障。

故障排除：首先使用8通道头颈联合线圈和正交头线圈扫描均正常，基本排除系统以及连接头的故障。

通常情况下，医院操作技师将体线圈的上片插口插在P1位置，下片插口插在P2位置，通过查看系统报错记录：“Connector：Port 2（P2）…Fault value：7943 mV，Channel： 2→”，发现系统报错指向P2插口。

为了确定是线圈的哪一部分故障，交换上下两片插口，然后依次插在P1和P2位置，扫描时候报错随之转移，报错记录显示：“Connector：Port 1（P1）…Fault value：7943 mV，Channel：2→”，错误指向P1位置。

MR750临床应用知识讲解

1800
900
1800 900
1800 900
MR750 3.0T
SAR值的影像因素
TR长度 — 越短SAR值越高短TR，高SAR的扫描序列 • FIESTA，True-Fisp，Balanced-FFE
MR750 3.0T
SAR值的影像因素
Exciting RF的翻转角度
当发射射频脉冲时，原子核吸收射频脉冲的能量，从低能级状态越迁到高能级状态
3T
1.5T
FSE T2 512 x 256 2 NEX
MR750 3.0T
MR750 3.0T
3T 带给我们的安全问题
1. 静磁场强度增加一倍:
杜绝一切磁共振相容性有疑问的装置进入。
2. 射频能量的蓄积：
a. 严防患者灼伤 b. 高热患者绝对禁忌
3.快速切换的梯度场带来的问题：噪音问题
PNS （Peripheral Nerve Stimulation）
MR750临床应用
MR750 3.0T
3T 带给我们的安全问题
1. 静磁场强度增加一倍:
杜绝一切磁共振相容性有疑问的装置进入。
2. 射频能量的蓄积：
a. 严防患者灼伤 b. 高热患者绝对禁忌
3. 快速切换的梯度场带来的问题：噪音问题
PNS （Peripheral Nerve Stimulation）
2. TR长度 — 越短SAR值越高
3. Exciting RF的翻转角度 4. 扫描层数 5. 患者体重
Predicted SAR
T1 FSE SAR vs Weight
3.20 3.00 2.80 2.60 2.40 2.20 2.00 1.80 1.60

GE MR750 简介

Operator Panel
LPCA A
2nd
Pen Wall
P1
Байду номын сангаасP2
Filters and I/F
Ramp/Shi m Access & Brainwave H e
H2 O
Gradient Filter Scan Room
H e
H2 O
P3 & P4 Connectors Touch-n-Go Landmarking
Primary Display Host PC
SCIM
Intercom
MOD (no longer available)
Jan 2010 Rev 6
Same - a little more detail…
Equipment room
Term Block I/O XG A Cabinet I/O XPS Broadban d RF Amp Power Distribution PDU XPS XPS XG A XG A Cabinet I/O
• • •
Total business focus required to ensure success
Jan 2010 Rev 6
The MR750 TEAM…
Florence Bangalore MKE
Monterrey
Jan 2010 Rev 6
Hino
DVMR Milestones
Originally called TNT (The Next Thing) 2006 The first MR Program that replaced ME with MV (verification and validation) Discovery MR750 went to M4 -- Summer 2009 And now IB_1 and IB_2… Discovery MR450 went M3 same date But, now… DV APPS (22.x) milestones to be kicking in… Discovery and Optima MR450 (DV APPS) to a new M3 - Summer 2010 Optima MR450W to M3 – same timeframe?

宝石CT和MR750报纸设计

2013年12月24日星期二编辑：杨维杰校对：张爱东版式：夏鹏版面内容设计：李善杰高清海马微细结构高清关节细微骨小梁高清脊柱神经高清血管高清盆腔亮点三：高端高清的大脑里的纤维束成像，我们看到的每一根纤维束精准的脑灌注成像，精利用容积成像功能观察一些比较细小的神经，比如三叉神经、面神经等颅内12对脑神经。

有一种病叫三叉神经痛，大家可能都知显示细微出血，临床上可用于诊断微量出血、静脉血管畸形、毛细血管扩张症、出血性脑梗MRI“类PET”——平民健康保障磁共振类PET，又称磁共振全身弥散加权成像，是一种利用水分子的布朗运动进行的一种成像方式，是继CT-PET后又一种崭新的进行全身肿瘤筛查的检查手段，对机器性能要求很高。

由于我院的磁共振设备具有双梯度高场强，梯度场强和切换率在业内最高，可以满足磁共振类PET的技术要求，并获得满意的图像。

与PET-CT相比，不同之处主要有：①成像原理不同。

②经临床应用证实磁共振类PET对肿瘤的敏感性与PET-CT相仿，但价格却只有PET-CT的三分之一。

④磁共振类PET无任何辐射，对人体无任何损害。

⑤MR 类PET对原发肿瘤病灶、转移病灶和淋巴结侵犯均可一次性检出。

磁共振类PET的临床应用主要有：1、原发肿瘤的筛查2、转移瘤的筛查3、淋巴结转移的筛查4、肿瘤的分期5、良恶性病变的鉴别。

6、肿瘤治疗后的复查7、健康人群的常规全身体检病例分析：男性50岁，间断黑便2年半，胃镜诊断胃底部及胃体部低分化腺癌，入院行胃癌根治术，术后行常规化疗。

A图为化疗前，显示肝内多发转移瘤；B图为介入化疗后当天复查，肿瘤体积较前增大，但类PET成像信号减低，提示化疗有效；C图为2个月后复查，肿瘤体积较前明显缩小，但信号增高，提示部分肿瘤有活跃趋势，建议患者二次化疗，但患者家属认为肿瘤缩小存在好转趋势拒绝接受第二次化疗；D图为2个半月后复查，肿瘤体积明显增大，类PET信号增高，提示病情进展。

由此可以看出，常规的超声、CT和MR检查虽然能够直观的观察治疗后肿瘤体积的变化，但肿瘤体积的变化不能准确反映病情的严重程度与进展程度，而磁共振类PET成像对肿瘤治疗疗效的评估有着重要的意义。

脑血管灌注成像临床应用

6

CT灌注成像的理论基础为核医学的放射性示踪剂稀释原理和中心容积定律(central volume principle)：BF= BV/MTT。 BF指在单位时间内流经一定量组织血管结构的血流量(ml/min/ml)； BV指存在于一定量组织血管结构内的血容量 (ml/g)；MTT指血液流经血管结构时,包括动脉、毛细血管、静脉窦、静脉，所经过的路径不同，其通过时间也不同，因此用平均通过时间表示，主要反映的是对比剂通过毛细血管的时间(S)； TTP指TDC上从对比剂开始出现到对比剂达峰值的时间(S)。
“脑梗死前期”：
从CBF变化过程看，脑血流量的下降到急性脑梗死的发生,经历3个变化时期： 1 由于脑灌注压下降引起脑局部血流动力学异常改变 2 脑局部CCR失代偿性低灌注所造成的神经元功能改变（这2个过程合称为梗死前期） 3 当CBF下降超过CMR才发生不可逆转的神经元形态学改变，即脑梗死
25
ml/100g/min
7
二．磁共振灌注成像（Perfusionweighted MR imaging，PWI）

磁共振灌注成像是指用来反映组织的微血管灌注分布及血流灌注情况的磁共振检查技术。目前依据其成像原理可大致分为二种类型，即对比剂首过灌注成像、动脉血质子自旋标记技术。
8
一、对比剂首过灌注成像（dynamic contrast enhanced MRI，DCE MRI）
CBF—每克组织中所包含液体流量(ml/g/s)
中心容积定律(central volume principle)：BF= BV/MTT。
动态增强磁共振成像（dynamic contrast enhanced MRI，DCE MRI）磁共振

Leica DM750 手册说明书

Leica DM750手册目录内容提要2目录3安全概念5这本操作手册中所用的符号6重要提示7使用说明8使用说明 (续) 9健康风险和使用安全10仪器负责人的信息11保养说明12附件、维护和维修13气数据和环境条件14引言16拆箱17显微镜台下照明19连接观察镜筒20Leica EZ 观察镜筒—集成目镜21Leica EZ 观察镜筒—集成目镜 (续) 22徕卡标准观察镜筒—独立目镜23防护眼罩24安装物镜25安装物镜25安装显微镜台下聚光器26安装显微镜台下聚光器 (续) 27开启显微镜29完整的聚光器对中30完整的聚光器对中 (续) 31使用聚光器32准备观察样本载玻片33聚焦34观察镜筒调节35观察镜筒调节 (续) 36Koehler 设定37Koehler 设定 (续) 38油浸技术39油浸技术 (续) 40延时关闭41准备！设置！开始！43常规维护45常规维护 (续) 46安全性规定安全概念Leica DM 立体显微镜系列的各个模块都带有一张包含所有相关用户手册的交互式CD 光盘 (具有多种语言版本)。

请将其放在安全且便于取用的地方。

也可以从我们的网站下载和打印用户手册和更新：.本操作手册描述了 Leica DM 立体显微镜系列中各个模块的特殊功能，并包含有关其操作安全、维护及附件的重要说明。

“安全概念”册子包含了有关立体显微镜、附件与电气附件的维修工作、要求与操作的附加安全信息，以及常规的安全说明。

可以将各个系统的相关文件与外部供应商提供的文件结合起来(例如冷光源等)。

请阅读本用户手册和供应商提供的安全要求。

在安装、操作或使用仪器之前，请先阅读上述用户手册。

尤其是要仔细阅读所有安全说明。

为了使仪器保持其原始状态，并确保操作安全，用户必须遵守上述用户手册中的说明和警告。

这本操作手册中所用的符号危险警告• 此符号表示特别重要的信息，必须仔细阅读并严格遵守。

否则可能会导致以下后果：人身伤害Ϙ功能性故障或仪器损坏Ϙ危险电压警告此符号表示必须阅读和遵守的非常重要的信息。

飞利浦mr扫描方案

飞利浦MR扫描方案简介飞利浦MR扫描方案是飞利浦公司开发的一种医学成像技术，用于获取人体内部结构的高分辨率图像。

该技术基于磁共振成像（Magnetic Resonance Imaging，MRI）原理，通过利用磁场和无害的无线电波与人体组织进行相互作用，产生图像。

MR扫描方案在医疗诊断和研究领域具有广泛应用，可以提供详细的人体解剖结构信息，并对各种疾病进行定量评估和监测。

飞利浦作为世界领先的医疗设备制造商，提供了一系列的MR扫描方案，以满足不同医疗需求。

技术原理磁共振成像是通过对人体组织中的氢原子进行定位和成像来获取图像。

人体组织中的氢原子（主要是水和脂肪中的氢）具有自旋（Spin）特性，可以发出特定频率的无线电信号。

在磁场的作用下，这些氢原子会发生共振，即吸收并释放能量，产生信号。

飞利浦MR扫描方案中的核心部件是磁共振设备。

该设备由主磁场系统、梯度线圈系统和无线电频率系统组成。

主磁场系统产生强大的静态磁场，梯度线圈系统产生可控的磁场梯度，无线电频率系统用于产生和接收无线电波。

扫描过程中，患者被放置在磁共振设备中，主磁场使得氢原子的自旋朝向与磁场方向一致。

梯度线圈产生空间变化的磁场梯度，使得不同位置的氢原子产生不同频率的信号。

通过接收和处理这些信号，可以重建出人体内部的结构信息，并生成图像。

功能特点飞利浦MR扫描方案具有以下功能特点：1.高分辨率图像：该扫描方案利用先进的图像重建算法和优化的硬件设备，可以获得高分辨率、清晰度高的图像，用于明确人体解剖结构。

2.多模态成像：除了常规的T1加权和T2加权成像，飞利浦MR扫描方案还支持多种成像模态，例如增强扫描、弥散加权成像等，以提供更多的图像信息。

3.快速扫描速度：该方案通过优化扫描序列和增加梯度线圈性能，使得扫描速度得到提高，可以在较短时间内完成扫描，减少患者不适感。

4.全身扫描：飞利浦MR扫描方案不仅适用于特定部位的扫描，还可以进行全身扫描，以全面评估患者的健康状况。

3.0T MR高分辨增强扫描在缺血性脑卒中颅内动脉粥样硬化斑块中的诊断价值

doi：10.3969/j.issn.1009-4393.2021.03.018--论著--3.0T MR高分辨增强扫描在缺血性脑卒中颅内动脉粥样硬化斑块中的诊断价值邢文强，谢英同，蔡婷（鞍山市长大医院影像科，辽宁鞍山114007）摘要：目的探讨3.0T MR高分辨增强扫描在缺血性脑卒中颅内动脉粥样硬化斑块中的诊断价值。

方法选取2017年9月至2019年7月本院收治的60例缺血性脑卒中患者作为研究对象，按照头颅MR平扫（DWI高信号）至高分辨MR检查时间间隔进行分组，时间＜4周设为早期组（n=26），时间为4～12周设为中期组（n=20），时间＞12周设为晚期组（n=14）。

观察比较3组检查结果。

结果早期组患者斑块明显强化占比高于中期组和晚期组（P＜0.05），轻度强化占比与中期组、晚期组比较差异无统计学意义；中期组轻度强化占比高于晚期组（P＜0.05）；晚期组无强化占比高于早期组、中期组（P＜0.05）。

3组斑块强化率随时间间隔的增加程度有所减低，差异有统计学意义（P＜0.05）。

结论采用3.0T MR高分辨增强扫描可有效辨别斑块的强化程度与位置。

关键词：3.0T MR高分辨增强扫描；缺血性脑卒中；颅内动脉粥样硬化斑块The value of3.0T MR high resolution enhanced scanning in the diagnosis of intracranial atheroscleroticplaque in ischemic strokeXING Wenqiang,XIE Yingtong,CAI Ting(Department of Radiology,Anshan Changda Hospital Anshan City,Anshan,Liaoning,114007,China) Abstract:Objective To explore the diagnostic value of3.0T MR high-resolution enhanced scanning in cerebral atherosclerotic plaques of ischemic stroke.Methods60patients with ischemic stroke in our hospital were selected as the research objects.The treatment time was from Sep-tember2017to July2019.The patients were divided into two groups according to the time interval from DWI high signal to high resolution MR. The early group(n=26)was set as the time＜4weeks,the middle group(n=20)was set as the time4-12weeks,and the late group(n=14)was set as the time＞12weeks.The results of the three groups were observed and compared.Results The proportion of plaque enhancement in early group was higher than that in middle group and late group(P＜0.05),the proportion of mild enhancement in middle group was higher than that in late group(P＜0.05),and the proportion of non enhancement in late group was higher than that in early group and middle group(P＜0.05).The plaque enhancement rate of the three groups decreased with the increase of time interval,the difference was statistically significant(P＜0.05). Conclusion 3.0T MR high resolution enhanced scan can effectively identify the degree and location of plaque enhancement.Key words:3.0T MR high resolution enhanced scanning;Ischemic stroke;Intracranial atherosclerotic plaque脑卒中是一种急性脑血管疾病，指脑血管意外破裂或阻塞，无法为脑组织正常提供血液和氧气，进而导致脑损伤[1]。

SR-750系列使用说明书_CN

96M12870
固定座二维条码读取器
SR-750 系列
操作说明书
为了获得最佳性能，请在使用本产品之前阅读本操作说明书。请在阅读本操作说明书之后将其保存在安全的地方，以备随时查阅。
符号
以下符号为本手册中的重要提示信息。请务必仔细阅读。
၌!ნ 表示若不遵守该注意事项，将导致人员伤亡。 ੸!ࡻ 表示若不遵守该注意事项，可能导致人员伤亡。 ᄆ!ᄩ 表示若不遵守该注意事项，可能导致人员遭受轻微或中度的伤害。 ᎙!ሃ 表示若不遵守该注意事项，将导致本产品损害以及财产损失。
剂的布。）
有关法规及标准的注意事项
有关 CE 标识
本公司根据下列条件，已确认本商品符合 EC 指令的必要规范。若在欧盟各国使用本产品，请务必遵循下列各项规范。
z EMC 指令（2004/108/EC） • 适用规格 EMI ：EN61326-1, Class A
EMS ：EN61326-1 备注：但是，此等要求并不保证组装含有本产品的机械装置可完全符合 EMC 指令的必要条件。机械装置制造商应对最终产品本身是否符合 EMC 指令单独负责。
੸!ࡻ ᄆ!ᄩ ᎙!ሃ
• ข႙ਖׁٛ൰ቂ቙เເডເ࿒‫॓߷ࠍؠ‬ፇ಼ܿȃ • ׁٛ൰‫؜‬໻ठᏮၓ߷֯ٛ൰ܿ໪ቂȃข႙኷၌ნ٠ྈञ / ড෈኷ᇸ֯०੼፩໪ቂ
ׁٛ൰ȃ
• ත‫ވ‬ञ‫غ‬Ꮾ SR-750 Ⴜளፇ෇ˈ‫כ‬ᅐᆬಖ SR-750 Ⴜள኷࢙೙ञᄹ೙ߴಅከᎡጸ ٢ȃ
• ၻ౦ਓሊ‫ت‬ถ቏ᄌ՗ภ‫܈‬໚ˈ߷ፒွᇜߙໍࢽጊ໢ዉ‫ڈ‬ใटཿࣷȃ • ข႙ᇵۨ‫ۃ‬ၝࣙ‫ߴܿށ‬໮໪ቂ SR-750 Ⴜளٛ൰ȃࠨዏ૰೙ܷ፛টኳȂ‫ݢ‬দডࢽ
ጊȃ
• ޭ቙‫ت‬ቂ‫؜‬࿷቙ׁ‫غ‬Ꮾངಖ༚ྈ༧ SR-750 Ⴜளࣙࢆܿߴ໮੣ᄵ‫غ‬ᏮˈডຖᏋ࡙ Ꭷ SR-750 Ⴜளˈ KEYENCE ႇߟ֦ጽ SR-750 Ⴜள࢙ܿ೙ডᄹ೙ȃ

头部ASL灌注成像

MR750
* GE Healthcare Discovery MR750w
动脉自旋标记成像原理, Arterial Spin Labeling
Discovery MR750
动脉自旋标记成像，是对在成像平面的上游血液进行标记使其自旋弛豫状态改变，待被标记的血流对组织灌注后进行成像。
两组对比图像: 标记像，成像区包含静态组织和流入组织的标记血液信息。非标记像，对成像区进行的非标记血液成像，同样包括静态背景组织信息。
PLD时间（1.5-2.5s） PLD延长，SNR下降
Discovery MR750 Spiral K-Space
临床应用灌注技术的比较, ASL和PWI
Discovery MR750
3D ASL
2D PWI
1
直接反映组织灌注
反映高浓度通过血管时的磁敏感效应，大分子造影剂无法通过血脑屏障。
2
不需要造影剂
连续式
脉冲式
动脉自旋标记ASL成像, GE提供FAIR（科研模式）、3DASL（临床模式）两种成像和后处理技术。
动脉自旋标记成像定量, Arterial Spin Labeling
脉冲式动脉自旋标记成像，理论上可以得到三个血液动力学参数:
血流量BF（用于临床定量指标）血容量BV（科研理论）平均通过时间MTT（科研理论）
Discovery MR750
Eur Neurol 2010;64:21–26
FAIR
3DASL
动脉自旋标记ASL成像, GE提供FAIR（科研模式）、3DASL（临床模式）两种成像和后处理技术。
动脉自旋标记成像, 2D FAIR
FAIR成像过程与后处理: 基于GRE EPI序列。第一次采样，使用选择性翻转

心脏MR反转恢复序列TI时间手动与自动选择一致性研究

心脏MR反转恢复序列TI时间手动与自动选择一致性研究高向东;李星;李静;苏晋生【摘要】目的探讨心脏磁共振(CMR)反转恢复序列的反转时间(TI)在判断心肌活性中的临床应用价值及TI选择方法的一致性.方法回顾性分析同时经反转恢复序列TI手动与自动选择获得磁共振心肌活性图像的30例冠心病患者,分析总结出其图像特点.结果在反转的反转恢复技术比较,其手动与自动选择TI时间时图像质量及心肌与血池对比程度,显示对于图像质量最佳时TI有较强的一致性.结论在磁共振心肌活性成像的临床应用中应恰当、合理地选择反转时间的反转恢复技术,才能获得最佳的心肌与血池对比的图像,以利于诊断与鉴别诊断.【期刊名称】《中西医结合心脑血管病杂志》【年(卷),期】2012(010)007【总页数】2页(P876-877)【关键词】心肌活性;磁共振成像;反转时间;反转恢复技术【作者】高向东;李星;李静;苏晋生【作者单位】太原市中心医院,030001;山西医科大学;山西医科大学;太原市中心医院,030001【正文语种】中文【中图分类】R541;R256.2心脏磁共振扫描（CMR）是多模式的成像设备，可评估包括心血管解剖结构及功能在内的多种参数，可形象的称为“一站式”检查的重要影像学方法，在心脏疾病中得到了广泛应用。

而在心肌延迟强化的MR序列中最常用的是反转恢复序列（IR），其最初应用于肝脏［1］。

随着MR成像技术的发展，逐步应用于全身各部位，且可以手动或自动选择反转时间（TI），而两种方法一致性的比较，有待于探讨［2］。

本文旨在比较两种方法显示图像质量的一致性，从而更好地改善图像质量，提高诊断率。

1 资料与方法1.1 病例资料收集冠心病患者30例，男16例，女14例。

分别进行不同反转时间，实验组（A）：TI＝280－320ms，手动选择TI。

对照组（B）：自动选择TI下分别多次采集其心肌活性图像。

1.2 仪器设备及扫描参数选用SIEMENS公司的Sonata1.5T超导心脏磁共振系统，选用体部相控阵及表面心脏专用线圈，胸前导联心电门控仪，进行闭气扫描。