Chapter 02: Specialized Imaging Techniques
Eisenberg: Comprehensive Radiographic Pathology, 7th Edition
1. If an organ or material does not produce internal echoes on ultra sound it is considered to
be what? Answer: anechoic
2. What is an interaction that produces two high-energy photons (gamma rays) in opposite
directions? Answer: annihilation
3. What contains multiple parallel channels to allow x-rays to pass? Answer: collima- tor
4. What imaging specialty produces cross-sectional tomographic images by first scanning a
slice of tissue from multiple angles with a narrow x-ray beam? Answer: computed
tomography (CT)
5. What number is defined as the attenuation of a specific tissue relative to that of water?
Answer: CT number
6. What type of imaging relies on the movement of molecules and random thermal motion?
Answer: diffusion imaging
7. What type of imaging equipment is designed to image two modalities simultaneously and
integrate the images? Answer: direct fusion
8. What type of MRI allows the localization of specific regions of the brain that correspond
to various functions? Answer: functional MRI (fMRI)
9. What is defined as spiral continuous motion? Answer: helical
10. What is a term used to make comparisons of echo intensities between adjacent
structures? Answer: hyperechoic
