Week #9 Review Flashcards
Where are lead aprons used?
Wherever ionizing radiation is used
Who are lead aprons used by?
-MRT
-Patients
-Other health care professionals
How much lead is required for examinations with peak xray voltage of 100kV or less?
0.25 mm of lead
How much lead is required where peak xray voltage is greater than 100kV and less than 150kV?
0.35mm of lead
How much lead is required where peak xray voltage is 150kV or greater?
0.5mm of lead
How often does personal protective equipment need to be tested for defects?
Yearly
How is personal protective equipment examined yearly?
Using radiographic or radioscopic equipment
What is the unacceptable limit for area of defect for lead aprons?
Total defective area greater than 670mm^2
How are lead test done?
Under live imaging (fluoroscopy)
What is the size limit for defects for ppe used in thyroid or reproductive organ areas?
Larger than or equivalent to 5mm diameter circle
What is the thickness of the full wrap around lead gowns used for interventional procedures?
0.50mm Pb (front panels)
0.25mm Pb (back panels)
What thickness of lead is recommended for thyroid shielding?
0.50mm Pb
What ppe is recommended where scatter radiation to the eye could approach the annual equivalent dose limit of 150mSv?
Leaded glasses
What is the lead required for gonadal shielding?
At least 0.25mm Pb
0.50mm at 150kVp
What lead equivalency is required for protective gloves?
0.25mm Pb
What lead equivalence is required for ceiling mounted lead acrylic screens and moveable shields?
0.50mm Pb
(Attenuation value must be marked on all protective screens and shields)
What is the standard for HARP for protective accessories for people who may receive exposure to X-rays in a facility?
At least, 0.50mm Pb equivalent at 150 kVp is available
Systematic process of cataloging rejected images and determining the nature of the repeats
Repeat Analysis
What does repeat analysis provide information about?
-equipment performance
-accessory performance
-departmental procedures
-staff skill level
What are the main advantages of repeat analysis?
-lower patient does
-improve department efficiency
-lower department costs
What is the reason for most repeats?
-film/screen: inadequate exposure
-digital radiography: positioning
What is the minimum number of patients for a sample size for a repeat analysis?
250 patients
What is the maximum total retake rate?
Less than 5%, not including quality control films
According to SC35, how often should a repeat analysis be performed?
Monthly
