Mammo

Question 1

What are the effects of compression?

Answer 1

• Decreased thickness–> less scatter and lower dose needed
• less motion artifact
• Better spatial resolution (less magnification)
• Better Contrast (lower kVP and less scatter)

Question 2

What is the bucky factor for contact mammo?

Answer 2

2 for Mammo

5 for general radiographs

Question 3

How is magnification view different from contact view?

Answer 3

• Smaller focal spot
• Lower mA
• Longer exposure time
• Air Gap= No grid needed
• Higher Dose (Breast closer to source)

Question 4

What is PPV 1, 2, and 3?

Answer 4

• PPV 1: Positive for Cancer on a positive screener (4%)
• PPV 2: Positive for Cancer with Biopsy recommended (25%)
• PPV 3: Positive for Cancer with Biopsy performed (31%)

Question 5

What should be tested for Daily in Mammo?

Answer 5

-Process QC
-Dark Room Cleanliness
“PD comes to work Daily”

Question 6

What should be tested for Weekly in Mammo?

Answer 6

-Viewbox conditions
-Phantom Evaluation
“VP comes to work Weekly”

Question 7

What should be tested for quarterly in Mammo?

Answer 7

-Repeat Analysis

RQ (Ricu)

Question 8

What should be tested for Semi-Annually in Mammo?

Answer 8

• Compression Test
• Dark Room Fog
• Screen Film Contrast

CDS visits semi annually

Question 9

What spatial resolution is required from mammo?

Answer 9

Approximately 11-13 lp/mm in the phantom

Question 10

What is the breast phantom?

Answer 10

4.2 cm of 50% Glandular/50%fatty tissue

Question 11

What is the dose limit of the phantom?

Answer 11

3 mGy with a Grid

1 mGy without a grid