ARRT registry review covering image production
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| The fixed spatial resolution characteristic of direct digital systems is termed by what? | TFT & DEL size (Lange Q&A p. 167)
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| An algorithm, as used in x-ray imaging, is/ are what? | A series of variable instructions (Lange Q&A p.167 )
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| The part of a detector element (DEL) that stores electrical charges is the | Capacitor (Lange Q&A p.168 )
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| Grid cutoff due to off-centering would result in what? | Overall loss of receptor exposure (Lange Q&A p. 169)
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| The postprocessing function that removes high frequency noise from an x-ray image is | Smoothing (Lange Q&A p.169 )
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| If an IR exposed using a 12:1 ratio grid exhibits loss of signal at its lateral edges, it is probably because why? | SIF was too great (Lange Q&A p.169 )
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| What can foreshortening be caused by? | The radiographic object being placed at an angle to the IR (Lange Q&A p.169 )
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| The device that functions that terminates the x-ray exposure following ionization of a particular quantity of an air is the | AEC (Lange Q&A p.170 )
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| The primary function of x-ray beam filtration is to | Reduce patient dose (Lange Q&A p.171 )
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| What part of the detector element (DEL) that functions as a switch/gate to release charges for readout is the | TFT (Lange Q&A p.171 )
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| What device is used to overcome severe variation in patient anatomy or tissue density, providing more uniform receptor exposure? | Compensating filter (Lange Q&A p.172)
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| The distance between the center of one pixel and the center of an adjacent pixel is termed what? | Pixel pitch (Lange Q&A p.173 )
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| Because of the anode heel effect, the intensity of the x-ray beam is greatest at | Cathode end of the beam (Lange Q&A p.173)
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| Analog-to-digital conversion is required in which of the following imaging system? | A larger field matrix (Lange Q&A p.173)
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| For the same field of view (FOV), spatial resolution will be improved using | A larger matrix (Lange Q&A p.173 )
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| In what way does SID affect sharpness of an images detail? | Image detail sharpness is directly related to SID (Lange Q&A p.175 )
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| The quality assurance term used to describe consistency in exposure at adjacent mA station is | Linearity (Lange Q&A p.175 )
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| What factors impact spatial resolution? | Focal spot size, subject motion, and SOD (Lange Q&A p.175 )
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| How are milliampere seconds and patient dose related? | Milliampere seconds and patient dose are directly proportional (Lange Q&A p.176 )
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| What is an example of a pathologic condition that would require a decrease in exposure factors? | Emphysema (Lange Q&A p.176 )
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| What pixel size has a 512X512 matrix with a 20cm field of view (FOV)? | 040mm/pixel (Lange Q&A p.176 )
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| Foreshortening of the radiographic image is a result of what? | Improper part alignment (Lange Q&A p.177 )
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| Misalignment of the tube-part-IR relationship results in what? | Shape distortion (Lange Q&A p.177 )
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| Exposure rate will decrease with an increase in | SID (Lange Q&A p.178 )
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| As digital image matrix size increases what happens? | Pixel size decreases (Lange Q&A p.178 )
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| What can distortion be caused by? | Tube angle, the position of the organ or structure within the body, and the radiographic positioning of the part (Lange Q&A p.178 )
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| Decreasing field size from 14x17 inches to 8x10 inches, with no changes will? | Decrease the amount of scattered radiation generated within the part (Lange Q&A p.178 )
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| Reduction in x-ray photon intensity as it passes through numerous tissue densities is termed | Attenuation (Lange Q&A p.179 )
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| Scattered radiation can impact the image negatively, but has no effect on | Spatial Resolution (Lange Q&A p.179 )
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| The material comprising the IP front must be | Homogeneous/ radiolucent (Lange Q&A p.180 )
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| OID is related to image sharpness/ spatial resolution in which of the following ways? | Sharpness/ resolution is inversely related to OID (Lange Q&A p.180 )
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| The purpose of the electroconductive layer of a CR-PSP plate is to | Facilitate transportation through the scanner/reader (Lange Q&A p.180 )
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| What pixel has a 2048x2048 matrix with a 60cm FOV? | -0.3mm (Lange Q&A p.180 )
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| As window width increases what happens? | Brightness decreases (Lange Q&A p.180 )
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| Ionizing radiation intensity decreases as | Distance from the source of radiation increases (Lange Q&A p.180 )
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| The radiographic accessory used to measure the thickness of body parts to determine optimal selection of exposure factors is the | Caliper (Lange Q&A p.181 )
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| The x-ray image is seen on the computer display monitor is a/an | Analog image (Lange Q&A p.181 )
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| A radiograph made with a parallel grid demonstrated decreased receptor exposure on its lateral edges. This is most likely due to what? | Decreased SID (Lange Q&A p.181 )
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| As digital detector element (DEL) size decreases | Spatial resolution increases (Lange Q&A p.182 )
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| An increase in kilovoltage will serve to | Increase photon energy (Lange Q&A p.182 )
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| The maximum spatial resolution in digital imaging is equal to the | Nyquist frequency, which is 1/2 x the pixel pitch (mm) (Lange Q&A p.183 )
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| The processing algorith represents the | Anatomical part and projection (Lange Q&A p.183 )
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| The relationship between the height of a grid's lead strips and the distance between them is called grid | Ratio (Lange Q&A p. 183)
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| What are advantages of high kilovoltage chest radiography? | Reduces patient dose & exposure time can be shorter (Lange Q&A p.183 )
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| The line-focus principle expresses the relationship between what? | The actual and the effective focal spot (Lange Q&A p.184 )
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| Why is a short exposure time essential in chest radiography? | To imimize involuntary motion (Lange Q&A p.185 )
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| The term windowing describes the practice of | Changing the image brightness and/or contrast scale(Lange Q&A p.186 )
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| In digital imaging, thin film transistor (TFT) and detector element (DEL) size is related to | Spatial resolution (Lange Q&A p.186 )
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| A compensating filter is used to | Even out widely differing tissue densities (Lange Q&A p.187 )
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| The ratio of the pixel's sensing area to the area of the pixel itself refers to | Fill factor (Lange Q&A p.187 )
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