Question 1

Which of the following will detect the light from the CsI scintillator in the indirect flat-panel TFT detector?

Accepted Answer

A)   TFT switch
B)   sensing area
C)   storage capacitor
D)   active matrix B

Question 2

Flat-panel detectors can be used in portable radiography applications and in applications involving ____________________.

Accepted Answer

fluoroscopy

Question 3

With indirect flat-panel TFT digital detectors, what is used to first convert X-ray photons into light photons?

Accepted Answer

A)   scintillator layer
B)   k-edge characteristic
C)   electrical charge
D)   photoconductor A

Question 4

Flaws include dust, scratches, chemical reactions among the various materials that the detector is made of as well as defective ____________________.

Accepted Answer

The answer of Flaws include dust, scratches, chemical reactions among...

Question 5

Which layer used in the indirect flat-panel digital detector is usually either cesium iodide (CsI)or gradolinium oxysulfide (Gd?O?S)?

Accepted Answer

A)   flat panel
B)   thin-film transistor
C)   X-ray scintillator
D)   amorphous silicon

Question 6

Flat-panel digital detectors are complex devices and pose numerous challenges in the ____________________ process.

Accepted Answer

The answer of Flat-panel digital detectors are complex devices and...

Question 7

In imaging, the goal is to obtain good ____________________ information in the image.

Accepted Answer

The answer of In imaging, the goal is to obtain...

Question 8

Which of the following reduces the output image from the scintillator phosphor to the size of the CCD array?

Accepted Answer

A)   pixel detector
B)   exposure indicator
C)   photoconductor
D)   optical system

Question 9

____ refer(s)to the persistence of the image; charge is still being produced after the radiation beam from the X-ray tube has been turned off.

Accepted Answer

A)   Image lag
B)   Image artifacts
C)   Image flaw
D)   Image effect

Question 10

The ____________________ technology was developed as a dedicated system specifically for imaging the chest.

Accepted Answer

The answer of The ____________________ technology was developed as a...

Question 11

The purpose of the a-Si photodiode layer is to convert the light from the X-ray detection ____________________ into electrical charges.

Accepted Answer

The answer of The purpose of the a-Si photodiode layer...

Question 12

One important physical concept that is essential to understanding the rationale for the use of specific X-ray ____________________ and a-Se in digital detectors is that of X-ray attenuation or absorption.

Accepted Answer

The answer of One important physical concept that is essential...

Question 13

In imaging applications, because contrast resolution (the ability to resolve small differences in tissue contrast)is mandatory for diagnostic interpretation, ____ is important.

Accepted Answer

A)   low SNR
B)   high DQE
C)   high SNR
D)   low DQE

Question 14

An MTF of ____ represents a perfect transfer of spatial and contrast information.

Accepted Answer

A)   1
B)   2
C)   3
D)   4

Question 15

For digital imaging systems, the spatial resolution depends on the size of the ____________________ in the matrix.

Accepted Answer

The answer of For digital imaging systems, the spatial resolution...

Question 16

The purpose of a photodiode is to collect and store the electrical charge produced in the a-Si photodiode array.

Accepted Answer

A) True 
 B)False

Question 17

For the flat-panel TFT digital detectors used in ____________________, the readout process and readout electronics are somewhat different to the detectors used for radiographic applications.

Accepted Answer

The answer of For the flat-panel TFT digital detectors used...

Question 18

The flat-panel TFT digital detector uses complex and sophisticated electronic circuitry to read out the electrical charges produced and stored in the matrix array.

Accepted Answer

A) True 
 B)False

Question 19

Optimization of the image displayed on monitors for viewing by both technologists and radiologists requires a good working knowledge of not only image processing but also display ____________________ principles and technology.

Accepted Answer

The answer of Optimization of the image displayed on monitors...

Question 20

The column artifact arising from a bad column of pixels indeed provides a rationale for ongoing ____________________ of the digital imaging system.

Accepted Answer

The answer of The column artifact arising from a bad...

Exam 5: Flat-Panel Digital Radiography