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Direct Radiography System

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Questions and Answers

What is the primary difference between direct and indirect digital conversion in radiography?

The need for intermediate light production (correct)
The sensitivity to ambient temperature variations
The type of detector material used
The type of phosphors used

What is the primary function of a transistor receiver in a cassette-less radiography system?

To improve image resolution
To amplify the x-ray signal
To reduce image noise
To convert x-ray energy into a digital signal (correct)

What is the typical resolution required for a monitor to display a radiographic image with quality approaching that of a film image?

512 x 512 pixels
4096 x 4096 pixels
1024 x 1024 pixels (correct)
2048 x 2048 pixels

What is the primary purpose of image post-processing in digital radiography?

To reduce image noise and optimize contrast (A) Signup and view all the answers

What type of phosphors are commonly used in indirect digital conversion?

Thallium doped Cesium Iodide (CsI) (C) Signup and view all the answers

What is the name of the detector material used in direct digital conversion?

Amorphous Selenium (D) Signup and view all the answers

What is the purpose of the intense light source in the CR process?

To erase the residual image from the plate (B) Signup and view all the answers

What is the primary difference between Computed Radiography (CR) and Direct Digital Radiography (DR)?

CR uses a two-stage process, while DR uses a single-stage process (A) Signup and view all the answers

What is the role of the Analog to Digital converters (ADC) in the CR process?

To digitize the signal from the photomultiplier tube (D) Signup and view all the answers

What is the relationship between the emitted light intensity and the original incident X-ray intensity?

The emitted light intensity is directly proportional to the original incident X-ray intensity (A) Signup and view all the answers

What is the purpose of the optical array in the CR process?

To capture the emitted light intensity (B) Signup and view all the answers

What is the primary advantage of Direct Digital Radiography (DR) over Computed Radiography (CR)?

DR eliminates the need for a separate image capture and readout process (A) Signup and view all the answers

What is the primary function of an intensifying screen in conventional radiography?

To emit light when x-rays strike it (D) Signup and view all the answers

In Computed Radiography (CR), what is the role of photostimulable phosphors?

To convert x-ray energy into a latent image (A) Signup and view all the answers

What is the main difference between Computed Radiography (CR) and Direct Digital Radiography (DR)?

CR uses film while DR uses a digital detector (B) Signup and view all the answers

What is the final step in the radiography workflow of conventional radiography?

Storage of the film in the file room (D) Signup and view all the answers

What is the primary advantage of digital imaging over conventional radiography?

Ability to view and store images on a computer (D) Signup and view all the answers

What is the purpose of a CR reader in digital radiography?

To read the latent image on a photostimulable phosphor plate (A) Signup and view all the answers

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