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Imaging Acquisition

QuestionAnswer
What is the laser in a PSP reader? Light amplification of stimulated emission of radiation (pg.64)
Name the two types of scan for PSP. Point scan and line scan (pg.63)
What type of PSP reader uses a CCD? Line scan (pg. 64)
What is another name for recorded detail? Spatial resolution (pg. 67)
What is the determinant for spatial resolution in film/screen? Crystal size and thickness of phosphor layer (pg. 67)
What is the determinant for spatial resolution in PSP? Phosphor layer thickness and pixel size (pg.67)
How often should PSP cassettes be scanned? Atleast once weekly (pg.69)
What is the recommended kVp range an most digital systems? 45-120 kVp (pg.71)
What is quantum mottle? When the image appears "grainy" from lack of phosphor stimulation (pg.72)
What is the difference between high resolution and standard PSP imaging plates? The high-resolution have a thicker phosphor layer (pg.72)
What artifact is a result of the grid lines and scanner laser are running parallel? Moire artifact
Why is grid usage more important to PSP than film/screen? PSP is more sensitive to scatter (pg.73)
What is grid frequency? Number of grid lines per cm or in (pg. 74)
What does the grid ratio refer to? The height of the lead strips in relation to the space between them (pg.74)
Why should a technologist collimate tightly? It reduced scatter radiation and patient radiation (pg.74)
Name the layers in an imaging plate. Protective, phosphor, reflective, conductive, color, support and backing layers (pg.)
True or False? Imaging plates need to be read ASAP in order to maintain the energy stored. True (pg.83)
What are the two types of conversion in TFT? Direct and indirect (pg.86)
Which conversion type includes an amorphous selenium photoconductor? Direct (pg. 87)
Which TFT conversion includes gadolinium oxysulphide or doped cesium iodide photoconductors? Indirect (pg.87)
What is a dead pixel referring to? Malfunctioning pixels (pg. 91)
What is image lag? When the previous exposure was not completely erased in the reader (pg. 93)
What focuses the light into a CCD chip during CCD image capture? Lenses or fiber optics (pg.103)
Name the two categories of phosphors in CCD detectors? Structured and unstructure (pg.102)
What steps of image acquistion in a CMOS system Scintillator converts xrays to light, then stores then in a capacitor. The pixel amplifier converts the light into an electric charge. The charge is set to an ADC and sent to the monitor (pg. 105)
How does TFT system acquire images through direct conversion xrays are converted into electrons that are stored in the capacitator and then converted into electrical charges, which are sent to the image processor (86)
True or False? An unstructured scintillation layer is less efficient? True (pg.87)
What is gain callibration? Removes densities where pixels have malfunctioned (pg.92)
What process collects the charge from chips by charging the voltage sign on the electrode and moving the electrons down columns until the readout row is reached? Bucket brigade scheme (pg. 101)
What is an excess of electrons in a del called? The blooming effect (pg.101)
What is statistical noise? Noise created by lack of light from scintillator (pg.103)
What is amplification noise Malfunctioning and normally functioning computer chips send varying signals causing statistical variations (pg.103)
Reference: Carter, Christi; Veale, Beth. 2014. Digital Radiography and PACS. 2nd ed. Elservier. Maryland Heights, MO.
Created by: 100000127726387
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