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Introduction
Ho Kyung Kim
Pusan National University
Introduction to Medical Engineering (Medical Imaging)
Medical imaging modalities
• Digital radiography (DR)
• Computed tomography (CT)
• Nuclear medicine
– Scintigraphy
– Single photon emission computed tomography (SPECT)
– Positron emission tomography (PET)
• Ultrasound imaging (echography)
• Magnetic resonance imaging (MRI)
• Radiation therapy (RT)
– Linear accelerator (LINAC)
2
Definition
• Transmission imaging
• Emission imaging
3
• Planar imaging, a kind of still shot
• Fluoroscopy (dynamic imaging), angiography, cardiology
• Tomography (rendering cross-sectional & 3-D views)
Cross-sectional images (tomograms)
4
Taken from the Lecture Slides (Dr. Lee Jae Sung, SNU)
Modality
Radiation
Role
Resolution
Contrast
Radiation exposure
WB scan time
PET
-ray
Funct/Mole
Relatively low
Very high
Low
10~20 min
CT
X-ray
Anat
Very high
Medium
High
few min
MRI
RF
Anat/F/M
High
Medium
None
10~20 min
Dual-energy imaging
20
Original Soft tissue Bone tissue
Image Courtesy of F. Nicholas, GE Medical Systems