Nuclear Medicine Instrumentation
1) The amount of light generated by a sodium iodide crystal is directly
related to the:
2) photon energy absorbed in the crystal
3) Diameter of the crystal
4) Thickness of the crystal
5) Age of the crystal: A. photon energy absorbed in the crystal
6) A NaI (Tl) scintillation detector provides an output signal from the photo-
multiplier tube that is proportional in amplitude to the amount of energy
absorbed in the crystal 2. The photopeak of a spectrum of Tc99m
represents gamma rays which:
7) Interact only by photoelectric effect
8) Interact in the crystal and deposit all of their energy there
9) Interact only by Compton scatter
10) none of the above: B. Interact in the crystal and deposit all of their energy
there
11) Most photoelectric interactions result in full deposition of the gamma energy
in the detector
12) If the FWHM (Full Width Half-Maximum) is 15 KeV, what is the energy
resolution for a peak of Tc99m?
13) 2%
14) 7.5%
, Nuclear Medicine Instrumentation
15) 11%
16) 15%: C. 11%
17) % energy resolution is equal to the FWHM divided by the peak energy (140
KeV) times 100.
18) (15/140 * 100)= 11%
19) Of the following, the two most important quality assurance
measurements of a scintillation camera imaging system are:
20) Focus; Astigmatism
21) Energy resolution; Counting efficiency
22) Field Uniformity; spatial resolution
23) Deadtime; resolving time: C. Field Uniformity; spatial resolution
24) Spatial resolution is a determinant of image quality, while field uniformity
assesses detector performance
25) Which of the following radionuclides would be used as a source to
calibrate a detection system used for Tc99m?
26) Cs 137
27) Cr 51
28) Co 57
29) Ba 133: C. Co 57
30) The energy of Co 57 (122 KeV) is closest to Tc99m (140
KeV) 6. The basic function of all collimators is to:
1) The amount of light generated by a sodium iodide crystal is directly
related to the:
2) photon energy absorbed in the crystal
3) Diameter of the crystal
4) Thickness of the crystal
5) Age of the crystal: A. photon energy absorbed in the crystal
6) A NaI (Tl) scintillation detector provides an output signal from the photo-
multiplier tube that is proportional in amplitude to the amount of energy
absorbed in the crystal 2. The photopeak of a spectrum of Tc99m
represents gamma rays which:
7) Interact only by photoelectric effect
8) Interact in the crystal and deposit all of their energy there
9) Interact only by Compton scatter
10) none of the above: B. Interact in the crystal and deposit all of their energy
there
11) Most photoelectric interactions result in full deposition of the gamma energy
in the detector
12) If the FWHM (Full Width Half-Maximum) is 15 KeV, what is the energy
resolution for a peak of Tc99m?
13) 2%
14) 7.5%
, Nuclear Medicine Instrumentation
15) 11%
16) 15%: C. 11%
17) % energy resolution is equal to the FWHM divided by the peak energy (140
KeV) times 100.
18) (15/140 * 100)= 11%
19) Of the following, the two most important quality assurance
measurements of a scintillation camera imaging system are:
20) Focus; Astigmatism
21) Energy resolution; Counting efficiency
22) Field Uniformity; spatial resolution
23) Deadtime; resolving time: C. Field Uniformity; spatial resolution
24) Spatial resolution is a determinant of image quality, while field uniformity
assesses detector performance
25) Which of the following radionuclides would be used as a source to
calibrate a detection system used for Tc99m?
26) Cs 137
27) Cr 51
28) Co 57
29) Ba 133: C. Co 57
30) The energy of Co 57 (122 KeV) is closest to Tc99m (140
KeV) 6. The basic function of all collimators is to:
