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Unit 1 Exam

QuestionAnswer
Quantum noise is a result of too few x-ray photons reaching the image receptor.
A radiographic image that has brightness levels that are very different from each other has high contrast.
Normal adult respiration is: 12 to 16 breaths per minute.
Making the digital image appear with low contrast, many shades of gray, is done by increasing the window width (wide WW).
What is a measure of the imaging system’s ability to display the contrast of anatomic objects varying in size? modulation transfer function
It is not possible for a photoelectric interaction to occur between a 50-keV x-ray photon and an atom with inner-shell electrons that have a binding energy of 60 keV or more. True
The control that adjusts the contrast by adjusting the visible range of brightness levels on the image is the window width.
At higher kilovoltages within the diagnostic range the percentage of Compton interactions increases.
Bradycardia indicates a pulse of: fewer than 60 beats per minute.
What refers to the range of exposure intensities an image receptor can accurately detect? dynamic range
When the image is distorted, spatial resolution is also decreased. True
Spatial resolution can be increased by: Increasing the pixel density Decreasing the pixel pitch
Objects that are being imaged can be misrepresented radiographically by distortion of their shape. This is called shape distortion.
Causing a patient to become apprehensive of being injured is called assault.
The type of shock that occurs secondary to heart failure is called: cardiogenic shock.
Density was the term used to describe "overall film blackeing" for film screen or conventional imaging. What term is used in digital imaging to describe this quality? receptor exposure
With digital imaging, the ___________ of radiation reaching the image receptor determines the brightness of the image. intensity
When the image of a structure appears longer than the actual structure, there is elongation.
For every 4–5 cm of tissue, the x-ray beam quantity is reduced by approximately 50%
When the foot is placed directly on the image receptor, there is no OID. False
Transmission refers to x-rays leaving the patient that did not interact with atoms
Increasing the matrix size for a fixed field of view (FOV) results in: increased spatial resolution. smaller pixel sizes
The probability of a Compton interaction occurring depends on the energy of the incoming x-ray photon.
Size distortion is also called magnification.
Scattered and secondary radiation can be eliminated during radiographic imaging. Spatial resolution
The radiographer should evaluate the ____________ value along with the quality of the digital image before determining whether a repeat image is warranted. exposure indicator
Resolution is typically measured in line pairs per millimeter.
Which of the following combinations would result in an image with the least amount of magnification? Decreased OID and increased SID
A digital image is composed of a combination of rows and columns recorded as a: latent image.
In order to minimize shape distortion in the image, what three factors should be properly aligned? x-ray tube. image receptor. anatomic part.
Increasing the thickness of the part being imaged results in increased attenuation.
Decreased attenuation results in more x-ray photons reaching the image receptor.
The radiographic misrepresentation of either the size (magnification) or the shape of the anatomic part is called distortion.
With the photoelectric interaction, after the incident photon ejects an inner-shell electron, the energy of the incident photon is reduced to zero.
The various shades of gray or brightness created on the radiographic image. are present because of differential absorption. represent the radiation that was absorbed or transmitted. makes the anatomic structures visible.
When the image of a structure appears shorter than the actual structure there is shape distortion.
The type of shock that occurs when toxins produced during infection cause a dramatic drop in blood pressure is called: septic shock.
Scatter radiation decreases the visibility of anatomic structures.
If there were no contrast, the radiographic image would include only the same shade of gray.
At higher kilovoltages within the diagnostic range the percentage of photoelectric interactions decreases.
Place the digital imaging steps in the correct order, 1. Remnant radiation reaches the digital image receptor 4. The latent image is processed by the computer 2. The manifest image is displayed on a monitor 3. The manifest image can be adjusted because it is composed of digital data
The higher the ______________ of a system, the lower the radiation exposure required to produce a quality image. detective quantum efficiency (DQE)
Which of the following is a method of describing the strength of the radiation exposure compared with the amount of noise apparent in a digital image? signal-to-noise ratio
Brightness fluctuations on the image is called quantum noise.
The probability of a Compton interaction is _______________ in bone than soft tissue. the same
Place the tissue types in order from most radiolucent to most radiopaque. Lungs Fat Muscle Bone
After processing, there is a image. manifest and visible
What digital characteristics affects the number of shades of gray available for image display? pixel bit depth
The distance from the center of one pixel to the center of the one next to it is pixel pitch.
Scattering in the diagnostic range is due to the Compton effect.
A radiographic image that has brightness levels that are very similar to each other has low contrast and has long-scale contrast.
Making the digital image appear with high contrast, more black and white, is done by decreasing the window width (narrow WW)
After the x-ray beam enters the patient and has many photoelectric interactions, the quantity of the beam increases. False
Violation of confidentiality defines: invasion of privacy.
Which of the following refers to the absorption characteristics of the anatomic tissues radiographed and the quality of the x-ray beam? subject contrast
Neglect or omission of reasonable care defines: unintentional misconduct.
An artifact that is imaged within the patient’s body is a foreign body.
Coherent scattering has minimal effect on the imaging process.
Radiographic contrast allows visibility of anatomic structures.
Created by: DeAndreMitchell
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