CRI Advanced Imaging Techniques 2

Question 1

In computed radiography (CR), the imaging plate stores a latent image as trapped electrons in which material?

Accepted Answer

Photostimulable phosphor (BaFBr:Eu)

Answer

CR imaging plates use photostimulable phosphor (typically europium-doped barium fluorobromide) to store the latent radiographic image as excited electrons.

Question 2

Which tomographic reconstruction algorithm is most commonly used in industrial CT scanning due to its computational efficiency?

Accepted Answer

Filtered back projection (FBP)

Answer

Filtered back projection is the dominant algorithm in industrial CT because it offers fast reconstruction with well-understood artifacts and adequate image quality.

Question 3

When performing real-time radioscopy, the image intensifier tube converts X-ray photons first into:

Accepted Answer

Visible light, then electrons, then amplified light

Answer

In an image intensifier, X-rays strike the input phosphor producing light, which ejects photoelectrons from the photocathode, and these are accelerated and focused onto the output phosphor to produce a brighter image.

Question 4

In digital detector array (DDA) systems, fill factor refers to:

Accepted Answer

The percentage of detector area actually sensitive to radiation

Answer

Fill factor is the proportion of each pixel's total area that is actually photosensitive; higher fill factor means more efficient photon capture.

Question 5

A flat panel detector exhibiting 'lag' artifacts will show which characteristic defect?

Accepted Answer

Ghost images from previous exposures overlaid on current images

Answer

Lag occurs when charge from a previous exposure is not fully cleared, creating ghost images superimposed on subsequent radiographs.

(CRI) Certified Radiographic Interpreter Practice Test

(CRI) Certified Radiographic Interpreter Practice Test

CRI Advanced Imaging Techniques 2