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Qa & Qc for CR/DR

imaging 2a qa & Qc

importance of quality for digital equipment 1. digital radiology is increasingly coming into use 2. detectors in digital systems have a large dynamic range 3. high doses are hardly noticeable in images 4. QC is essential to avoid unnecessary high doses and achieve good image quality
what does quality assurance consist of activities that provide adequate confidence that a radiology service will render consistently high quality images and services
medical aspect of quality assurance interpretation of images
technical aspect of quality assurance maintenance of equipment, performance of examinations
operational aspect of quality assurance filing systems, staff development, scheduling of examinations, supply lines
what is quality control aspect of quality assurance that monitors technical equipment to maintain quality standards
checklist for quality control for printers 1. geometric distortion 2. contrast visibility 3. printer artifacts 4. density response 5. uniformity
test patterns for monitors 1. SMPTE 2. TG18
what does SMPTE stands for Society of Motion Picture & Television Engineers
what does TG18 stands for Task Group 18
TG18 is created by AAPM
what does AAPM stands for American Association of Physicists in Medicine
features of TG18-QC 1. consists of small squared areas with different range of grey colours 2. each square of the 0% & 100% contains smaller squares of 5% & 95% 3. centre & edges 4. 6 squares
the centre and edges have high contrast bar patterns of black & white pairs
the 6 squares are filled with varying widths of alternating black/white horizontal and vertical lines
_______ lighting should be _______ but not off completely ambient, reduced
what is the range avoids reflections and still provide sufficient lighting about 25-40 lux
at about 25-40 lux _________________ most reflections and still provide _______________ ligthing avoids, sufficient
luminescence of monitors should be at least _____________ for conventional radiographs 200 cd/m2
_______________ range leads to ____________ levels of contrast in displayed images lower, inadequate
_________ range leads to _____ _________ of details due to the limited range of contrast ________ of human eye higher, poor visualisation, sensitivity
frequency checks for QC for monitors is done weekly
additional test patterns prescribed by manufacturers' QC programme is done monthly
what is the QC done for Direct detectors KCARE protocol
checklist for KCARE protocol 1. dosimetry 2. dark noise 3. detector dose indicator consistency 4. uniformity 5. blurring and stitching artifacts 6. limiting spatial resolution 7. TCDD
what does TCDD stands for Threshold Contrast Detail Detectability
characteristics of dosimetry 1. range of output exposures produced by tube current exposure time (mAs) are measured and recorded 2. Exposures are a function of tube & generator performance
characteristics of dark noise 1. assess level of noise inherent in the system 2. due to dark current : flowing leakage current when voltage is applied to the film to collect signal information 3. should be 0 in ideal state 4. generates noise on the pixel & reduces the signal intens
what is the factor for Fuji CR in dose detector index consistency sensitivity S)
what is the relationship of sensitivity and exposure for Fuji CR inversely proportional
what is the optimum range of dose detector index consistency of Fuji CR 150 - 250
what is the factor for Kodak CR in dose detector index consistency exposure index (EI)
what is the relationship of EI and exposure for Kodak CR proportional
what is the optimum range of dose detector index consistency of Kodak CR 1800 - 2200
what is the factor for Agfa CR in dose detector index consistency log median exposure (LgM)
what is the relationship of LgM and exposure for Agfa CR log system (increase of 0.3 means the dose was doubled)
what is the optimum range of dose detector index consistency of Agfa CR 1.9 - 2.5
what is the factor for Phillips DR in dose detector index consistency exposure index (EI)
what is the relationship of EI and exposure for Phillips DR inversely proportional
what is the optimum range of dose detector index consistency of Phillips DR 200 - 800
what is the factor for Siemens DR in dose detector index consistency exposure index (EI)
what is the relationship of EI and exposure for Siemens DR proportional
what is the optimum range of dose detector index consistency of Siemens DR depends on organ programme
what is dose detector index consistency a numerical value displayed with each exposure which correlates to dose
characteristics of dose detector index consistency 1. indicative of the dose which the image receptor receives, not that of patient
variation of dose detector index should be less than 5%
characteristics of uniformity 1. assesses uniformity of recorded signal from a uniformly exposed detector (1mm Cu at tube head) 2. full analysis requires calculation of standard deviation measured at ROI 3. subjective analysis by looking for non-uniforms & imperfections
why are DR detectors inherently non-uniform due to variations in electronic gain and offset & conversion layer thickness
how is limiting resolution and TCDD evaluated 1. use of TOR LEEDS test objects 2. spatial resolution : Line pairs/mm 3. contrast detectability : lowest contrast perceivable 4. image quality factor calculated
Created by: 656402553



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