Radiography Exam Radiology Tech 4

Question 1

What is the primary advantage of digital radiography (DR) over computed radiography (CR)?

Accepted Answer

Faster image acquisition with no cassette handling

Answer

Direct digital radiography (DR) captures images instantly via a flat-panel detector, eliminating the cassette handling and plate-scanning steps required in CR.

Question 2

What is the inverse square law as applied to X-ray intensity?

Accepted Answer

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

Answer

The inverse square law states that radiation intensity decreases as the inverse square of the distance from the source (I1/I2 = D2²/D1²).

Question 3

Which structure in the X-ray tube acts as the source of electrons?

Accepted Answer

Filament (cathode)

Answer

The filament, located within the cathode assembly, undergoes thermionic emission when heated, releasing electrons that are accelerated toward the anode.

Question 4

What does OID stand for and how does it affect image magnification?

Accepted Answer

Object-Image Distance; larger OID increases magnification

Answer

OID (Object-Image Distance) is the distance between the patient part and the image receptor; increasing OID increases geometric magnification and blur.

Question 5

Which type of ionizing radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Answer

Gamma rays (and X-rays), as high-energy electromagnetic radiation, have the greatest penetrating power among common ionizing radiations.

Radiography Exam Practice Test

Radiography Exam Practice Test

Radiography Exam Radiology Tech 4