Radiation Dose Optimization Practice Questions

Question 1

All are done to minimize radiation exposure to the patient under fluoroscopy, except which of the following?

Accepted Answer

Increasing fluoroscopic time

Answer

Decreasing fluoroscopic time

Answer

Using low dose of radiation

Answer

Decrease in field of view

Question 2

A pregnant woman with head trauma requires a CT scan of the head. What is the most effective radiation protection measure for the fetus?

Accepted Answer

Reduced mA and kVp

Answer

Using MRI instead

Answer

Lead apron over abdomen

Answer

Avoid CT, rely on clinical assessment

Question 3

Principles used in Radio Therapy are:

Accepted Answer

Ionizing radiation

Answer

Ultrasonic effect

Answer

Charring of nucleoprotein

Answer

Infrared rays

Question 4

For which malignancy is intensity-modulated radiotherapy (IMRT) the most suitable?

Accepted Answer

Prostate

Answer

Lung

Answer

Leukemias

Answer

Stomach

Question 5

To obtain adequate diagnostic imaging in a morbidly obese patient, what modification to X-ray technique is most important?

Accepted Answer

Increase KVP

Answer

Increase MAS

Answer

Decrease KVP

Answer

Decrease MAS

Question 6

A woman with endometrial carcinoma is undergoing radiotherapy. Which of the following statements about radiation therapy is true?

Accepted Answer

Intensity is inversely proportional to the square of the distance from the source.

Answer

Small intestinal mucosa is radioresistant.

Answer

Rapidly proliferating cells are radioresistant.

Answer

Small blood vessels are radioresistant.

Question 7

Which of the following typically results in the maximum radiation exposure?

Accepted Answer

PET CT

Answer

Chest X ray

Answer

IV pyelography

Answer

Barium Enema

Answer

X-ray abdomen

Question 8

A 7-week pregnant lady underwent a chest X-ray by mistake. What is to be done?

Accepted Answer

Reassure the patient and continue the pregnancy.

Answer

Terminate the pregnancy immediately due to radiation exposure.

Answer

Perform chromosomal testing to assess fetal damage.

Answer

Conduct prenatal invasive diagnostic tests to evaluate fetal health.

Question 9

Which of the following is a stochastic effect of radiation?

Accepted Answer

Genetic mutation

Answer

Alopecia in the irradiated portal

Answer

Local desquamation in the irradiated field

Answer

All of the options

Question 10

Which of the following statements about CT imaging is the MOST accurate?

Accepted Answer

Water has a Hounsfield unit (HU) of zero.

Answer

CT head dose remains constant regardless of the protocol used.

Answer

CT cannot detect gallstones under any circumstances.

Answer

CT uses unfiltered x-ray beams.

Radiation Dose Optimization — MCQs

Radiation Dose Optimization — MCQs

Want unlimited practice?