CBET Diagnostic Imaging Equipment 2

Question 1

What does 'kVp' control in an X-ray generator?

Accepted Answer

Penetrating power (energy) of the X-ray beam

Answer

Total number of X-ray photons produced

Answer

Rotation speed of the CT gantry

Answer

Depth of ultrasound penetration

Question 2

Which imaging modality uses radiofrequency pulses and a strong magnetic field rather than ionizing radiation?

Accepted Answer

MRI (Magnetic Resonance Imaging)

Answer

Fluoroscopy

Answer

Computed Tomography (CT)

Answer

Bone densitometry (DEXA)

Question 3

A portable X-ray unit's collimator is found to be misaligned during PM. Why is this clinically significant?

Accepted Answer

Misalignment exposes patients to unnecessary radiation outside the intended field

Answer

It makes images appear blurry

Answer

It overheats the X-ray tube

Answer

It increases patient dose to the intended field only

Question 4

In a PACS (Picture Archiving and Communication System), what standard protocol is used to transfer images?

Accepted Answer

DICOM (Digital Imaging and Communications in Medicine)

Answer

HL7 v2

Answer

TCP/IP only

Answer

IEEE 802.11

Question 5

What is the purpose of a daily QC phantom scan performed on a CT scanner?

Accepted Answer

To verify image quality metrics such as noise, uniformity, and CT number accuracy

Answer

To warm up the gantry motor

Answer

To sterilize the bore

Answer

To back up the PACS database

Question 6

Which component in an X-ray tube is the source of electrons?

Accepted Answer

Cathode filament

Answer

Anode disc

Answer

Rotor bearing

Answer

Glass envelope