LRA 221|Questions With Correct Answers|Verified
a standard that allows imaging modalities and PACS to communicate in the same
language - ✔️DICOM
The phosphor layer is made of phosphors from the ______ family. - ✔️barium
fluorohalide
Each square in a matrix is called a: - ✔️picture element
what is DQE (Detective Quantum Efficiency) - ✔️Efficiency of a system to convert xray
input into a useful output image
The type of flat-panel detector that uses thin films of silicon integrated with arrays of
photodiodes - ✔️amorphous silicon detector
X-ray energy direct capture DR will stimulate a ______, which eventually is changed
into an electrical signal. - ✔️Photoconductor
Exposure latitude is equal what in DR - ✔️Dynamic range
High pass filtering is useful for enhancing - ✔️Organs and soft tissue
Higher kvp does what to the histogram - ✔️Narrow
Changing the slope of the LUT graph will change what - ✔️Contrast
The improper algorithm application may result in - ✔️degradation of the image
Suppressing frequencies in the areas of interest is known as - ✔️masking
Image manipulation that fills in the background to make it dark - ✔️Shuttering
What is the smallest element in digital imaging - ✔️Pixel
Number is bits per pixel is known as - ✔️Bit depth
Focal spot and OID affect image sharpness - ✔️In both film/screen and digital imaging
images are produced with uniform brightness and contrast, regardless of the amount of
exposure used to acquire the image. - ✔️automatic rescaling
The longer the image is stored on the cassette in cr - ✔️The more energy is lost by the
electrons
, X ray strike the intensifying screen - ✔️Light is produced
Indirect and direct radiography both do not use what - ✔️A PSP
Photoconductor converts light energy into - ✔️Electrical signal
What are the two steps for the machine for indirect radiography - ✔️1. Convert photons
to light via the scintillator
2. Light to electrical signal via the photoconductor
What is the 1 step for the machine for direct digital radiography - ✔️Photoconductor.
Immediate ADC conversion
What are the two steps for the tech in computed radiography - ✔️1. Expose cassette
2. Place cassette into digitizer for ADC conversion
What is the active element in phosphor plates - ✔️Barium fluorohalide
PSP readers scan the phosphor plate with a - ✔️Focused laser light
What does a charged coupled device replace - ✔️ADC and photomultiplier tube
(CR) Photon energy is deposited within the phosphor particles creating - ✔️The latent
image
A focused laser light scans the latent image - ✔️Release the manifest image
Cr cassette can not be stored where - ✔️In the xray room near radiation source
Indirect dr what are the two different types - ✔️Thin film transistor TFT
charged coupled device
Three layers of Indirect TFT - ✔️Scintillation
Photodiode
TFT
Two layers of indirect ccd - ✔️Scintillation
Sensor chip
Another name for direct conversion - ✔️Non scintillation
Two layers of direct radiography - ✔️Amorphous silenium based super conductor
a standard that allows imaging modalities and PACS to communicate in the same
language - ✔️DICOM
The phosphor layer is made of phosphors from the ______ family. - ✔️barium
fluorohalide
Each square in a matrix is called a: - ✔️picture element
what is DQE (Detective Quantum Efficiency) - ✔️Efficiency of a system to convert xray
input into a useful output image
The type of flat-panel detector that uses thin films of silicon integrated with arrays of
photodiodes - ✔️amorphous silicon detector
X-ray energy direct capture DR will stimulate a ______, which eventually is changed
into an electrical signal. - ✔️Photoconductor
Exposure latitude is equal what in DR - ✔️Dynamic range
High pass filtering is useful for enhancing - ✔️Organs and soft tissue
Higher kvp does what to the histogram - ✔️Narrow
Changing the slope of the LUT graph will change what - ✔️Contrast
The improper algorithm application may result in - ✔️degradation of the image
Suppressing frequencies in the areas of interest is known as - ✔️masking
Image manipulation that fills in the background to make it dark - ✔️Shuttering
What is the smallest element in digital imaging - ✔️Pixel
Number is bits per pixel is known as - ✔️Bit depth
Focal spot and OID affect image sharpness - ✔️In both film/screen and digital imaging
images are produced with uniform brightness and contrast, regardless of the amount of
exposure used to acquire the image. - ✔️automatic rescaling
The longer the image is stored on the cassette in cr - ✔️The more energy is lost by the
electrons
, X ray strike the intensifying screen - ✔️Light is produced
Indirect and direct radiography both do not use what - ✔️A PSP
Photoconductor converts light energy into - ✔️Electrical signal
What are the two steps for the machine for indirect radiography - ✔️1. Convert photons
to light via the scintillator
2. Light to electrical signal via the photoconductor
What is the 1 step for the machine for direct digital radiography - ✔️Photoconductor.
Immediate ADC conversion
What are the two steps for the tech in computed radiography - ✔️1. Expose cassette
2. Place cassette into digitizer for ADC conversion
What is the active element in phosphor plates - ✔️Barium fluorohalide
PSP readers scan the phosphor plate with a - ✔️Focused laser light
What does a charged coupled device replace - ✔️ADC and photomultiplier tube
(CR) Photon energy is deposited within the phosphor particles creating - ✔️The latent
image
A focused laser light scans the latent image - ✔️Release the manifest image
Cr cassette can not be stored where - ✔️In the xray room near radiation source
Indirect dr what are the two different types - ✔️Thin film transistor TFT
charged coupled device
Three layers of Indirect TFT - ✔️Scintillation
Photodiode
TFT
Two layers of indirect ccd - ✔️Scintillation
Sensor chip
Another name for direct conversion - ✔️Non scintillation
Two layers of direct radiography - ✔️Amorphous silenium based super conductor
