医学影像学PPT：放射学(医学影像)

Principle of DSA Imaging
• A method for showing contrast-filled vessels without any interfering background.
• “Mask” image, just before the contrast medium is injected, onto which the images with contrast medium were overlaid to coincide, producing a subtraction image only displaying the contrast-filled vessels.
Diagnostic Imaging Methods
• Diagnostic imaging is a dynamic specialty that has undergone rapid change with continuing advancements in technology.
• Not only has the number of imaging methods increased but each one continues to undergo improvement and refinement of its use in medical diagnosis.
As x-ray pass through the human body they are attenuated by interaction with body tissues(absorption and scatter), resulting in an image pattern recognizable as human anatomy.
Radiographic Techniques
• The principle of selection
Safe Accurate Convenient Economic
Principles of x-ray
The x-ray beam is produced by bombarding a tungsten target with an electron beam within an x-ray tube.
Interventional Diagnosis Radiology
Therapy
The aim of our course is mainly to study the basic knowledge about diagnostic radiology: how to use x-rays, what can x-rays do for diagnosis of diseases, the various examination modalities, and what are the advantages and limitations of these examination modalities. Although a brief introduction of magnetic resonance (MR) is included in our course , ultrasound (US) and nuclear imaging will be taught in additional courses.
Principle of DR
RIS＋PACS＋Web
• PACS Picture Archiving and Communicating System
• RIS Radiological Information System
PACS 示意图
Digital Subtraction Angiography (DSA)
natural contast
Radiographic Techniques
• X-ray film • Fluoroscopy • Soft beam radiography for breast • Contrast administration examination
– The way of contrast administration
• direct：take orally、enema、inject into the vessels
• indirect：inject into the veins，physiological excretion
Digital Radiography DR
1. Computed Radiography CR，(imaging plate IP)
2. Digital Fluorography， DF (影像增强电 视系统，IITV)
3. Digital Radiography, DR (flat panel detectors)
Principle of CR
Radiographic Techniques
• Contrast administration examination
– contrast medium
• Higher density contrast：barium，iodine • Lower density contrast ：gas agents
RADIOLOGY (Medical Imaging)
Overview and Principles of Diagnostic Imaging
Medical Imaging
Diagnostic Imaging
Diagnostic Radiology Ultrasonography
Magnetic Resonance Nuclear Imaging
angiography
Computed Tomography
Introduction
Since its introduction in the 1970s, CT has been shown to have wide applications within all the radiological subspecialities. It has become a primary imaging technique in the clinic.