Nuclear Medicine Instrumentation UPDATED ACTUAL Questions and CORRECT Answers

Nuclear Medicine Instrumentation UPDATED ACTUAL Questions and CORRECT
Answers

B. Cr 51
The amount of light generated by a sodium iodide crystal
is directly related to the:
A. photon energy absorbed in the crystal
B. Diameter of the crystal
C. Thickness of the crystal
D. Age of the crystal
The photopeak of a spectrum of Tc99m represents gamma
rays which:
A. Interact only by photoelectric effect
B. Interact in the crystal and deposit all of their energy
there
C. Interact only by Compton scatter
D. none of the above
If the FWHM (Full Width Half-Maximum) is 15 KeV, what
is the energy resolution for a peak of Tc99m?
A. 2%
B. 7.5%
C. 11%
D. 15%
Of the following, the two most important quality assurance
measurements of a scintillation camera imaging system
are:
A. Focus; Astigmatism
B. Energy resolution; Counting eflciency
C. Field Uniformity; spatial resolution
D. Deadtime; resolving time

Which of the following radionuclides would be used as a
source to calibrate a detection system used for Tc99m?
A. Cs 137

, A. photon energy absorbed in the crystal

A NaI (Tl) scintillation detector provides an output signal
from the photo-multiplier tube that is proportional in
am-plitude to the amount of energy absorbed in the
crystal



B. Interact in the crystal and deposit all of their
energythere

Most photoelectric interactions result in full deposition
ofthe gamma energy in the detector



C. 11%

% energy resolution is equal to the FWHM divided by the
peak energy (140 KeV) times 100.
(15/140 * 100)= 11%



C. Field Uniformity; spatial resolution

Spatial resolution is a determinant of image quality,
whilefield uniformity assesses detector performance




C. Co 57

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