Unit IV Analyzing the Image Chapter 33 Quality Management.
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Transcript of Unit IV Analyzing the Image Chapter 33 Quality Management.
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Unit IV
Analyzing the Image
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Chapter 33
Quality Management
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Copyright © 2006 by Thomson Delmar Learning. ALL RIGHTS RESERVED. 4
Objectives
• Define quality assurance and quality control and discuss their relationship to excellence in radiography
• Describe process of identifying imaging requirements, selecting equipment, specifications, and training
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Objectives
• Describe objectives and responsibilities of monitoring equipment performance
• Discuss primary automatic film processor quality control monitoring and maintenance procedures
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Objectives
• Discuss primary quality control tests for:– External radiation beam monitoring of
diagnostic radiographic systems– Fluoroscopic systems– Tomographic systems– Automatic exposure controls
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Objectives
• List primary quality control tests for miscellaneous ancillary equipment, including cassettes and view boxes
• Explain rationale behind data collection process and basic analysis of a radiographic repeat-rate study
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Objectives
• Describe a basic troubleshooting procedure
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Quality Assurance and Quality Control
• Regulation and accreditation
• Quality assurance
• Quality control
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Regulation and Accreditation
• 1968 - Radiation Control and Safety Act
• 1981- Consumer-Patient Radiation Health and Safety Act
• 1990 - Safe Medical Devices Act
• 1992 - Mammography Quality Standards Act
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Regulation and Accreditation
• Enforced by Center for Devices and Radiological Health (CDRH)– Branch of the Food and Drug
Administration (FDA)
• Joint Commission on the Accreditation of Healthcare Organizations (JCAHO)– State and federal reimbursement
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Accreditation Agencies
• Establish quality standards
• Assess them
• Provide certification that individual facilities have met quality standards
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Quality Assurance
• Evolutionary process that provides quality images and services
• Medical, technical, or managerial in nature
• Identifies, monitors, and resolves problems
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Monitoring Problems
• Establish criteria
• Monitor performance
• Collect data
• Analyze data
• Evaluate data
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Quality Control
• Aspect of QA that is concerned with the equipment’s technical standards
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Purchasing Equipment
• Identification of imaging requirements
• Development of equipment specifications
• Selection of equipment
• Installation and testing of equipment
• Continuing education
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Identification of Imaging Requirements
• Team input– Radiologists, administrators, supervisors,
and staff technologists
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Development of Equipment Specifications
• Person determining specifications must have technical background
• Once specifications have been selected, send to vendors for bidding
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Selection of Equipment
• Compare bids for:– Ability to meet required specifications– Cost– Service
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Installation and Acceptance Testing of Equipment
• Responsibility of vendor/manufacturer
• QC must verify that acceptance testing specification has been met
• Include full disclosure of exact evaluation methods in specifications– Provides baseline to reference with future
QC testing
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Continuing Education
• Applications– QC and education coordinators– Should include orientation and periodic
updates
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Monitoring Equipment Performance
• Monitor quality of image processing systems
• Measure quality of external radiation beam
• Specify faults within these systems to allow corrective measures to be taken
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Responsibility
• Professional service personnel or medical physicists not required
• Radiographers can perform necessary daily testing– Initial cost to purchase test equipment– Time must be allotted in technologists work
day to complete tests
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Processor Monitoring
• Ensures that the processor is operating within proper limits
• Can be performed by anyone trained on the equipment used
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Processor Monitoring
• Tests include safelight test and processor sensitometry to monitor speed, contrast, and base fog of film
• Corrective actions should be made by radiographer or processor maintenance person
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External Beam Evaluation
• Tests should be performed by a radiographer
• Corrective action by authorized service person
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Diagnostic Radiographic Systems
• Semi-annual schedule
• Focal spot size estimation
• Half-value layer
• Angulator or protractor accuracy
• Kilovoltage accuracy• Timer accuracy
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Diagnostic Radiographic Systems
• Collimator, central ray, and Bucky tray accuracy
• Distance and centering indicators’ accuracy
• mR/mAs and milliamperage linearity
• Exposure reproducibility
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Focal Spot Size Estimation
• Important for proper recorded detail
• Three types of focal spot test tools:– Line pair resolution tools– Star test patterns– Pinhole cameras
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Half-Value Layer
• Measured by using dosimetry equipment to determine amount of filtration that will reduce beam intensity to one-half of its original value
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Collimator, Central Ray, and Bucky Tray Accuracy
• Light field and x-ray beam congruence crucial
+/- 2% of SID allowance
• Central ray1% allowance
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Distance and Centering Indicators
• Distance indicator+/- 10%
• Centering indicator+/- 2%
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Angulator or Protractor Accuracy
• Can be evaluated using a large protractor– +/- 1%
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Kilovoltage Accuracy
• Computerized dosimeter– +/- 5%
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Timer Accuracy
• Computerized dosimeters
• Spinning top– Single phase
• Motorized spinning top– Three phase
• +/- 5%
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mR/mAs and Milliamperage Linearity
• mA station accuracy is confirmed by mR/mAs measurement
• Computerized dosimeter
• +/- 10% between mA stations
• +/- 10% between high and low mA stations
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Exposure Reproducibility
• Computerized dosimeter
• +/- 5%
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Fluoroscopic Systems
• Exposure reproducibility
• Exposure rate
• Field size accuracy and beam alignment
• Source-to-skin distance limits
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Fluoroscopic Systems
• Intensifier viewing system resolution
• Intensifier viewing system contrast
• TV monitors and recorders
• Automatic brightness control
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Tomographic Systems
• Uniformity and completeness of motion
• Section depth indicator accuracy
• Section thickness accuracy
• Resolution
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Automatic Exposure Controls
• Exposure reproducibility
• Ion chamber sensitivity
• Density variation control accuracy
• Response capability
• Backup timer verification
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Ancillary Equipment
• Cassette cleaning and inspection– Film/screen contact
• View Box Uniformity
• Display monitors
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PACS Systems
• Accuracy of interface between PACS and EMR, HIS, and RIS
• Fix-queue
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Repeat Image Studies
• Obtaining data
• Analysis of data
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Troubleshooting
• Diagnostic process
• Beginning with assessment of symptoms
• Radiographer works through problem-solving process to determine the cause