第二章单元测试
- What part of an imaging system emits light when it has absorbed a photon?（ ）
- What happens to image size as the distance between a patient and a parallel hole collimator decreases? （ ）
- The images acquired as a SPECT camera rotates around
a patient are called: （ ） - Most of the photons emitted from the radiopharmaceutical which has been administered to a patient: （ ）
- A technologist covers the collimator (which is facing the ceiling) with absorbent paper and obtains a uniformity image using a liquid flood source with added 99mTc.A round cold spot is seen on the image. Subsequently the technologist removes the collimator, turns the camera face down and obtains another image using a point source placed on the floor. This image appears uniform.What is the most likely cause of the cold spot on the first image? （ ）
A:scintillation crystal
B:photomultiplier tube
C:pulse height analyzer
D:Collimator
答案:scintillation crystal
A:does not change
B:worsens
C:improves
答案:does not change
A:reconstructions
B:arcs
C:projections
D:azimuth stops
答案:projections
A:a and b
B:are converted to a voltage signal
C:do not contribute to the final image
D:are received by the sodium iodide crystal
E:b and c
答案:do not contribute to the final image
A:collimator defect
B:improper energy peaking
C:decoupled photomultiplier tube
D:subtle crystal crack
答案:decoupled photomultiplier tube
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