Week #9 Review

Question 1

Where are lead aprons used?

Answer 1

Wherever ionizing radiation is used

Question 2

Who are lead aprons used by?

Answer 2

-MRT
-Patients
-Other health care professionals

Question 3

How much lead is required for examinations with peak xray voltage of 100kV or less?

Answer 3

0.25 mm of lead

Question 4

How much lead is required where peak xray voltage is greater than 100kV and less than 150kV?

Answer 4

0.35mm of lead

Question 5

How much lead is required where peak xray voltage is 150kV or greater?

Answer 5

0.5mm of lead

Question 6

How often does personal protective equipment need to be tested for defects?

Answer 6

Yearly

Question 7

How is personal protective equipment examined yearly?

Answer 7

Using radiographic or radioscopic equipment

Question 8

What is the unacceptable limit for area of defect for lead aprons?

Answer 8

Total defective area greater than 670mm^2

Question 9

How are lead test done?

Answer 9

Under live imaging (fluoroscopy)

Question 10

What is the size limit for defects for ppe used in thyroid or reproductive organ areas?

Answer 10

Larger than or equivalent to 5mm diameter circle

Question 11

What is the thickness of the full wrap around lead gowns used for interventional procedures?

Answer 11

0.50mm Pb (front panels)
0.25mm Pb (back panels)

Question 12

What thickness of lead is recommended for thyroid shielding?

Answer 12

0.50mm Pb

Question 13

What ppe is recommended where scatter radiation to the eye could approach the annual equivalent dose limit of 150mSv?

Answer 13

Leaded glasses

Question 14

What is the lead required for gonadal shielding?

Answer 14

At least 0.25mm Pb
0.50mm at 150kVp

Question 15

What lead equivalency is required for protective gloves?

Answer 15

0.25mm Pb

Question 16

What lead equivalence is required for ceiling mounted lead acrylic screens and moveable shields?

Answer 16

0.50mm Pb
(Attenuation value must be marked on all protective screens and shields)

Question 17

What is the standard for HARP for protective accessories for people who may receive exposure to X-rays in a facility?

Answer 17

At least, 0.50mm Pb equivalent at 150 kVp is available

Question 18

Systematic process of cataloging rejected images and determining the nature of the repeats

Answer 18

Repeat Analysis

Question 19

What does repeat analysis provide information about?

Answer 19

-equipment performance
-accessory performance
-departmental procedures
-staff skill level

Question 20

What are the main advantages of repeat analysis?

Answer 20

-lower patient does
-improve department efficiency
-lower department costs

Question 21

What is the reason for most repeats?

Answer 21

-film/screen: inadequate exposure
-digital radiography: positioning

Question 22

What is the minimum number of patients for a sample size for a repeat analysis?

Answer 22

250 patients

Question 23

What is the maximum total retake rate?

Answer 23

Less than 5%, not including quality control films

Question 24

According to SC35, how often should a repeat analysis be performed?

Answer 24

Monthly