RAD 115 FINAL test 1-2
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Kcraft2384 on April 9, 2012
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56 terms
Terms | Definitions |
|---|---|
 A standard pattern made to measure the resolution of digital display systems is called __________ pattern | SMPTE |
| Medical images are transferred using the _______ standard | DICOM |
| The consistent appearance of transferred images on any compatible digital display device is achieved through ______ _______ | perceptual linearization |
| The quality control standard for FPDM was released by _____ in 1998 | VESA |
| The task group report 18 is a procedure name for _______________ | testing digital diagnostic device |
| A photometer is a _____ ______ | luminance meter |
| A telescope photometer is used as a distance of _____ | 1 m |
| Digital display relfection and ambient light conditions are assessed with ______ ______ | illuminance meter |
| Luminance response can be tested with a ____ and _____ photometer | near and telecopic |
| When evaluating the test pattern for geometric distortion all lines should appear _________ | straight |
| Specular reflection can be tested with the ______, ______. ______ | TG AD pattern, ambient light turned on, monitor turned off |
| Spatial resolution of digital display evaluated with ______ | TG 18 CX |
| Display noise measured using the _____ test pattern | TG 18 AFC |
| Daily evaluation of the monitors should be done with the _____ test tool | TG 18 QC |
| A continued quality control program for digital display device should include_____, ____, ____, ____ | acceptance testing, routine QC, periodic review, annual post review |
| what are 3 classes of digitial image artifacts | image receptor, software, objects |
| ghost image | imcomplete erasure |
| preprocessing corrects for what | dead pixels |
| Flatfielding corrects for | irregular testing patterns |
| The size and number of digital images compressed to permit _____, _____ | archiving and transferring |
| Object artifacts in digital images are due from | xray beam collimation, histogram selection, patient positioning |
| Backscatter radiation artifact can occur due to | highly sensitive receptors |
| A histogram is | frequency of ccurence vs. digital value |
| Look up table histogram is done by | the radiologic tech before the exam |
| Collimating all 4 sides prevents | histogram analysis errors |
| The 18 gauge hollow______needle with a stylet, developed in 1953, is used to puncture the femoral artery. | Seldinger |
| The most common risk for the angiography patient is ___________ | bleeding at the puncture site |
| The xray tube used for interventional radiology procedure has a _______ | small target angle |
| Interventional radiology requres xray equipment with a _______ | high power rating |
| The focal spot used for magnification of small vessels cannot be larger than ______mm | 0.3 |
| The size and construction of the _____determines the anode heat capacity | anode disk |
| The power rating for an interventional radiology tube should be at least _____kW | 80 |
| A fenestrated catheter is ______ | one with side holes at tip |
| When applied to contrast media, what does osmolarity refer to? | concentration of ions |
| The ____artery is the one most often accessed for arteriograms | femoral |
| A patient must have ______ prior to having an angiograph or interventional procedure | a history and physical exam, order IV hydration, a diet of clear liquids, EKG, BP, pulse |
| The use of _____reduces the rick of drug reaction during angiographic procedures | nonionic contrast |
| _______is an example of an IR procedure | Angioplasty |
| Which physicist first demonstrated the principle of CT in 1970? | Godfrey Hounsfield |
| Each CT projecton records variations in ____ and ____ | mass densities and effective atomic number |
| The cross section of anatomy is translated in _____during CT reconstruction | matrix values |
| The first generation of CT used _____ | single detector |
| The reduction in _______ was principle advantage of second generation CT scanner | scanning time |
| The third generation of CT scanners allowed for further reduction in ____ and _____ | scanning time and scattered radiation |
| The new developement in 4th generation CT scanners is the ____ | stationary detector array |
| Many Ct xray tubes have the capability for millions of _____ with each exam | heat units |
| The predetector collimator reduces scatter radiation from reaching the ______ | detector array |
| The patient dose in CT is determined by the _______ collimator | prepatient |
| CT scanners operate on _____ | high frequency power |
| A software program designed to do many computations simultaneously refers to _____ | algorithm |
| Each pixel of info in CT image contains numerical information in _____unit | hounsfield |
| The pixel size is reduces when the _____size is increased and the _____ size is fixed | matric, fov |
| ____ technology makes multislice spiral CT possible | slip ring |
| The CT scanner must be calibrated so that _____is at a CT number zero | water |
| Image noise in CT scanning depends on _____ | pixel size, kVp, filtration, detector efficiency, slice thickness, pt dose |
| Pixel Size equation | FOV/matrix (convert cm to mm) 1cm = 10mm |
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