RTBC-Digital Imaging Flashcards
Which image receptor system does not use light during exposure?
Direct-capture Digital Radiography (DR)
Which capture element is used in indirect digital radiography?
Cesium iodide
Which collection element is utilized with both direct and indirect digital radiography?
Thin-film transistor
How are signals created in computed radiography converted to a viewable image?
using and ADC
Which is true regarding marker conventions?
the markers should never obscure anatomy
Which component of the radiographic system absorbs x-rays and converts them into light?
indirect-capture detector
Which allows digital radiography (DR) to have a higher modulation transfer function (MTF) at low spatial resolution frequencies?
higher detective quantum efficiency (DQE)
What is the function of indirect capture digital radiography (DR)?
absorbing x-rays and converting them into light
What is true regarding digital radiography (DR) versus screen-film radiology?
DR is faster to process and DR is easier to view from multiple locations
Which test pattern should a radiologic technologist use to visually assess the geometric distortion in a digital display device?
TG 18-QC, TG 18-LPH, TG 18-LPV
Which test pattern is related to the luminescence response of reflected ambient light (L amb)?
TG 18-CT
Which test pattern is used for visually assessing angular dependence on a digital display device?
TG 18-CT
Which test pattern should a radiologic technologist use to visually assess nonuniformity in a digital display device?
TG 18-UN10
A radiologic technologist is evaluating the comprehensive characteristics of a digital display device using the TG 18-UNL80 test pattern. What is the radiologic technologist evaluating in this device?
luminance response
In its standards for teleradiology, the American College of Radiology (ACR) has recommended that which patterns should be used for QC purposes?
AAPM TG 18
Although the radiographer associates the patient’s identification and other data with each radiograph via the computer workstation, which image markers should still be physically placed on the image receptor (IR)?
right and left side markers
Which factors increase spatial resolution in computed radiography?
increase in sampling frequency and decrease in phosphor layer thickness
Which factors increase the patient radiation dose while performing computed radiography?
an increase in beam intensity and an increase in average beam energy
Which of these diagnostic procedures contributes to the highest occupational exposure of radiation to personnel?
fluoroscopy and mobile radiography
Which are most commonly used to diagnose a herniated nucleus pulposus?
Computed Tomography, Magnetic Resonance Imaging, and Myelography
What term in digital imaging is used to describe the process the computer uses to produce a uniform brightness and contrast regardless of the exposure?
Automatic rescaling
What is the subtraction technique?
it is a technique in which an initial image recorded during continuous fluoroscopy is subtracted from all other images produced
After how much time does an imaging plate exposed to radiation start losing its energy when used in computed radiography?
10 minutes
How is postprocessing controlled?
by the radiologic technologist
What is the minimal amount of kilovolts peak (kVp) that should be present on a technique chart used for computed radiography (excluding mammography)?
50
In a digital image receptor (IR), which electronic devices directly account for the plate’s ability to hold onto a charge until it is sent into the computer?
capacitors
Of the four key elements of the PACS system, which focuses on connecting numerous computers together?
network
What is the purpose of image compression in digital radiography?
easy file transfer
What is a standard method of data storage that was developed by ACR and NEMA?
DICOM
Which most accurately refers to the individual hardware elements of a digital radiography image receptor plate that detect radiation?
DEL
