Some questions have a single correct solution, and some have more than one corre

Question

Some questions have a single correct solution, and some have more than one correct solutions.

1. As the coating thickness of x-ray photographic film increases, the sensitivity _________ and the spatial resolution ____________.

A)decreases, increases

B)increases, decreases

C)increases, increases

D)decreases, decreases

2.What is a major health concern with MRI?

A)Localized burns due to metallic implants

B)Radiation dose

C)Reaction to applied drugs

D)Extreme cold

3.At diagnostic x-ray energies, the x-rays interact with tissue by these two processes;

A)Photoelectric absorption, Compton scatter.

B)Absorbed dose, Compton scatter.

C)Compton scatter, Pair production.

D)Photoelectric absorption, Exposure.

4Which of the following modalities does not use electromagnetic radiation to form an image?

a. X-Ray CT

b. MRI

c. PET

d. Ultrasound

e. SPECT

5)Multiple Choice: What color is water in a T1 weighted MRI scan?

A)White

B)Dark gray

C)Black

D)Light gray

6.If the patient table of a spiral CT scanner moves at 2 cm s-1, the x-ray source-detector apparatus rotates at 3 revolutions per second, and the slice thickness is 5 mm, what is the approximate pitch?

A)2

B)1.5

C)1.3

D)1

Explanation / Answer

1. B) sensitivity increases and resolution decreases.

2.A) localized burns

C) reactions due to applied drug.

3. B) absorbed dose and compton scattering

4. D) ultrasound

5. C) black

6. distance travelled in 3 revolutions= 2 cm

therefore distance travelled in 1 revolution=2/3=0.66cm=6.6mm

thickness is given as 5mm

pitch=distance travelled in 1 revolution/thickness=6.6/5=1.32=1.3 (option C )

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