Chapter 10 Quiz Canvas

________ is the standard format for digital medical images.

 

PACS

 

Teleradiology

 

DICOM

 

RIS

DICOM

Put the following sequence of events in this indirect capture system in order

1. The CCD converts the energy to an electronic signal
2. The light energy is then transmitted to the CCD
3. X-rays are absorbed by the scintillator and converted to light
4. Electronic signal is sent to the computer work station for processing and display

 

X-rays are absorbed by the scintillator and converted to light. The light energy is then transmitted to the CCD. The CCD converts the energy to an electronic signal. Electronic signal is sent to the computer workstation for processing and display.

 

The light energy is then transmitted to the CCD, The CCD converts the energy to an electronic signal, X-rays are absorbed by the scintillator and converted to light, Electronic signal is sent to the computer work station for processing and display

 

The CCD converts the energy to an electronic signal, The light energy is then transmitted to the CCD, X-rays are absorbed by the scintillator and converted to light, Electronic signal is sent to the computer work station for processing and display

 

Electronic signal is sent to the computer work station for processing and display, X-rays are absorbed by the scintillator and converted to light, The CCD converts the energy to an electronic signal, The light energy is then transmitted to the CCD

X-rays are absorbed by the scintillator and converted to light. The light energy is then transmitted to the CCD. The CCD converts the energy to an electronic signal. Electronic signal is sent to the computer workstation for processing and display.

Which of the following statements is true concerning direct capture (DR) systems?

 

Use storage phosphor to temporarily store energy representing the image signal and require that the storage phosphor undergoes a process to extract the latent image. 

 

Require that the storage phosphor undergoes a process to extract the latent image. 

 

Use storage phosphors to temporarily store energy representing the image signal. 

 

Have detectors that directly capture and read out an electronic image signal. 

Have detectors that directly capture and read out an electronic image signal. 

Part of the direct-capture DR system, the __________ absorbs x-rays and produces an electric signal.

 

CCD

 

photoconductor

 

scintillator

 

TFT

photoconductor

Amorphous selenium is used as the

 

photodetector for direct capture DR imaging

 

photoconductor for indirect capture DR imaging

 

photodetector for indirect capture DR imaging

 

photoconductor for direct capture DR imaging

photoconductor for direct capture DR imaging

The useful imaging area of the digital receptor is the

 

values of interest (VOI)

 

detector element (DEL)

 

field of view (FOV)

 

thin-film transistor (TFT)

field of view (FOV)

The range of exposures that produce acceptable information to be used in image formation is

 

bit depth

 

exposure latitude

 

exposure range

 

dynamic range

exposure latitude

Digital imaging preprocessing includes

 

histogram analysis

 

rescaling

 

none of these

 

rescaling and histogram analysis

rescaling and histogram analysis

Postprocessing functions

 

are done through computer software operations

 

include window width and window level adjustments

 

allow changes to be made in the appearance of the digital image

 

All of these

All of these

The value that indicates exposure to the IR with a DR imaging system is the

 

exposure indicator

 

dose-area product (DAP)

 

detective quantum efficiency (DQE)

 

dynamic range

dose-area product (DAP)

Related to the DR detector,______________ is an expression of the radiation exposure level that is required to produce an optimal image.

 

detective quantum efficiency (DQE)

 

exposure indicator

 

target exposure index

 

dose-area product (DAP)

detective quantum efficiency (DQE)

What would the DQE measure if the imaging system has 100% conversion efficiency?

 

0.5

 

2.0

 

0

 

1.0

1.0

The ideal expression of digital detector image resolution is the

 

limiting spatial resolution (LSR)

 

detective quantum efficiency (DQE)

 

Nyquist frequency

 

modulation transfer function (MTF)

modulation transfer function (MTF)

One half of the Nyquist frequency is equal to

 

the detective quantum efficiency (DQE)

 

the spatial resolution of a digital system

 

the contrast resolution of a digital system

 

the amount of noise in a digital system

the spatial resolution of a digital system

The primary factor influencing contrast with digital imaging is the

 

values of interest (VOI)

 

lookup table (LUT)

 

detective quantum efficiency (DQE)

 

modulation transfer function (MTF)

lookup table (LUT)

This test assesses the displayed luminance values versus the input values from the display system

 

luminance dependencies

 

reflection

 

resolution

 

luminance response

luminance response

________ allows for the acquisition, display, and storage of digital images. 

 

teleradiology

 

PACS

 

DICOM

 

RIS

PACS

Which of the following cassette-less digital image receptors does not use a network of TFTs?

 

None of the above use TFTs

 

Indirect capture with amorphous silicon photodetector

 

Indirect capture with CCD

 

Direct capture with amorphous selenium photoconductor

Indirect capture with CCD

The two methods for indirect capture in DR include

 

photoconductors and TFT arrays

 

scintillator and TFT array

 

charged-coupled devices

 

charged-coupled devices & scintillator and TFT array devices

charged-coupled devices & scintillator and TFT array devices

Which of the following digital detectors continues to improve and can be used in mammography and dental radiography?

 

photostimulable phosphor (PSP)

 

light-to-computer device (LTC)

 

charge-coupled device (CCD)

 

complementary metal oxide semiconductor (CMOS)

complementary metal oxide semiconductor (CMOS)

A material that absorbs x-ray energy and emits visible light in response is a 

 

photoconductor

 

charge-coupled device (CCD)

 

scintillator

 

thin film transistor (TFT)

scintillator

The scintillator for the indirect capture DR system that utilizes a CCD is 

 

barium fluorohalide

 

cesium iodide

 

amorphous selenium

 

crystalline silicon

cesium iodide

Amorphous silicon is used as the 

 

photodetector for direct capture DR imaging

 

photoconductor for direct capture DR imaging

 

photodetector for indirect capture DR imaging

 

photoconductor for indirect capture DR imaging

photodetector for indirect capture DR imaging

In an indirect capture DR system, the electronic components configured in a network of detector elements is the

 

scintillator

 

charge-coupled device (CCD)

 

thin film transistor (TFT)

 

photoconductor

thin film transistor (TFT)

Which of the following is true concerning direct capture DR imaging?

 

The DR direct-capture method avoids the loss of resolution caused by indirect-capture methods

 

All options are correct.

 

The DR direct-capture method uses a photoconductor and TFT array

 

The DR direct-capture method does not use a scintillator

All options are correct.