Topic 1

What component in CR systems emits light when stimulated by a laser?

• A. Photodiode

• B. Photostimulable phosphor

• C. Selenium layer

• D. Scintillator

Which material is used in PSP plates in CR?

• A. Cesium iodide

• B. Silver halide

• C. Europium activated barium fluorohalide

• D. Gadolinium oxysulfide

3. 3. What is the role of the Thin Film Transistor (TFT) in DR systems?

• A. Emit light

• B. Act as a switch

• C. Enhance contrast

• D. Convert X-rays to light

Which image processing technique improves the visibility of structures by increasing contrast?

• A. Image registration

• B. Image synthesis

• C. Image enhancement

• D. Image compression'

What is the goal of image segmentation?

• A. Reduce image size

• B. Sharpen image edges

• C. Identify and isolate regions of interest

• D. Color correction

What is the typical pixel size in DR systems?

• A. 50-100 microns

• B. 200-400 microns

• C. 100-200 microns

• D. 5-10 microns

What is a common component in both Indirect and Direct DR systems?

• A. Photodiode

• B. Photomultiplier tube

• C. Thin Film Transistor (TFT)

• D. Scintillator

What material is used as the photoconductor in Direct Conversion DR systems?

• A. Amorphous silicon

• B. Cesium iodide

• C. Amorphous selenium

• D. Gadolinium oxysulphide

What is the function of the scintillator in Indirect Conversion DR systems?

• A. Convert X-ray photons to electric charge

• B. Convert visible light to X-rays

• C. Convert X-ray photons to visible light

• D. Absorb noise in the image

What is the typical pixel size range in Digital Radiography systems?

• A. 50-100 microns

• B. 100-200 microns

• C. 200-300 microns

• D. 10-50 microns