| Question 1: 1. Patient entrance skin exposure for a screen/film radiography system with
film density being held constant will not depend on _____. |
| Reference: | Bushberg, Jerrold T., and John M. Boone. The essential physics of medical imaging. Lippincott Williams & Wilkins, 2011. |
| Choice A: | Film density depends on SID. |
| Choice B: | Film density depends on kVp. |
| Choice C: | Film density depends on grid ratio. |
| Choice D: | Film density depends on beam area. |
| Choice E: | Film density does not depend on focal spot size. |
| Question 2: 2. For a CT image acquired with 200 mAs, a change of 10 HU between
adjacent pixels equals a contrast of _____ %. |
| Reference: | Bushberg, Jerrold T., and John M. Boone. The essential physics of medical imaging. Lippincott Williams & Wilkins, 2011. |
| Choice A: | 0.02 |
| Choice B: | 1 |
| Choice C: | 2 |
| Choice D: | 10 |
| Choice E: | 14 |
| Question 3: 3. As a potential contrast agent for ultrasound, which of the following
materials would be expected to be the strongest reflector for a fixed
concentration of small (<5 m m) particles? |
| Reference: | Bushberg, Jerrold T., and John M. Boone. The essential physics of medical imaging. Lippincott Williams & Wilkins, 2011. |
| Choice A: | A solid polymer |
| Choice B: | A solid phospholipid |
| Choice C: | Encapsulated air |
| Choice D: | Aluminum |
| Choice E: | Protein |
| Question 4: 4. In a spin echo MRI pulse sequence with TR = 2000 msec and TE = 100
msec, the anatomy having the highest signal intensity in the resulting brain
image is _____. |
| Reference: | Bushberg, Jerrold T., and John M. Boone. The essential physics of medical imaging. Lippincott Williams & Wilkins, 2011. |
| Choice A: | Gray matter |
| Choice B: | White matter |
| Choice C: | Lens of the eye |
| Choice D: | CSF |
| Choice E: | Intracranial fat |
| Question 5: 5. According to NCRP 116, the occupational equivalent dose annual limit for
an extremity is ______ Sv. |
| Reference: | Bushberg, Jerrold T., and John M. Boone. The essential physics of medical imaging. Lippincott Williams & Wilkins, 2011. |
| Choice A: | 0.5 |
| Choice B: | 1.5 |
| Choice C: | 5 |
| Choice D: | 15 |
| Choice E: | 50 |
| Question 6: 6. Below is shown a series of repeat measurements of the output of an x-ray
tube and generator for an 80-kVp beam, 10 mAs at 1 meter. The coefficient
of variation of these measurements is _____. |
| Reference: | Bushberg, Jerrold T., and John M. Boone. The essential physics of medical imaging. Lippincott Williams & Wilkins, 2011. |
| Choice A: | 71. |
| Choice B: | 7.0 |
| Choice C: | 0.7 |
| Choice D: | 0.07 |
| Choice E: | 0.007 |
| Question 7: 7. A 5-MHz ultrasound beam is incident on a blood vessel at an angle of 45
degrees. If the blood is moving toward the transducer, and the mean velocity
is 30 cm/s, the mean frequency shift of the back-reflected power spectrum is ____ kHz. |
| Reference: | Hendee, William R., and E. Russell Ritenour. Medical imaging physics. John Wiley & Sons, 2003. |
| Choice A: | 0.7 |
| Choice B: | 1.4 |
| Choice C: | 2.8 |
| Choice D: | 5.6 |
| Choice E: | 11.2 |
| Question 8: 8. A CT ionization chamber has an active length of 10 cm. Dose is measured
with the body CTDI phantom positioned appropriately. A scan is performed at
130 kVp, 120 mAs and 5-mm slice thickness. The electrometer reading is
110 mR. (Assume an f-factor of 0.9 cGy/R.) The CTDI is _____ mGy. |
| Reference: | Hendee, William R., and E. Russell Ritenour. Medical imaging physics. John Wiley & Sons, 2003. |
| Choice A: | 12 |
| Choice B: | 20 |
| Choice C: | 32 |
| Choice D: | 40 |
| Choice E: | 44 |
| Question 9: 9. For a 30-cm FOV and a gradient strength of 2.1 mT/m, the change in
frequency of the protons at a distance of 10 cm from the null of the phase
encode gradient is _____ kHz. |
| Reference: | Hendee, William R., and E. Russell Ritenour. Medical imaging physics. John Wiley & Sons, 2003. |
| Choice A: | 40.6 |
| Choice B: | 26.8 |
| Choice C: | 21.3 |
| Choice D: | 8.9 |
| Choice E: | 2.1 |
| Question 10: 10. The modulation transfer function (MTF) curve is a plot of _____. |
| Reference: | Hendee, William R., and E. Russell Ritenour. Medical imaging physics. John Wiley & Sons, 2003. |
| Choice A: | Image contrast versus resolution |
| Choice B: | Subject contrast versus image contrast |
| Choice C: | Detail detection versus viewing condition |
| Choice D: | System characteristics versus component characteristics |
| Choice E: | Image contrast versus spatial frequency |
