Quiz 3 (PPT4)

Question 1

Improves contrast by enhancing or suppressing certain tissues such as fat (imaging modality)

Answer 1

MRI

Question 2

Can be acquired along coronal and sagittal planes (imaging modality)

Answer 2

MRI

Question 3

Disadvantages of use include distortions, artifacts, lack of signal from bone, have no relationship to electron density (imaging modality)

Answer 3

MRI

Question 4

MRI disadvantages: (4)

Answer 4

distortions
artifacts
lack of signal from bone
have no relationship to electron density

Question 5

a complex mathematical transformation of the datasets that aligns them together - Basically the overlay of one image on top of another

Answer 5

Image registration

Question 6

rescales and reorients the second image onto the first

Answer 6

Rigid registration

Question 7

What are the two main types of registration?

Answer 7

Rigid and deformable

Question 8

uses algorithms to perform piterm-18xel gradient analysis

Advantage is patient position does not have to be the same

Answer 8

Deformable registration

Question 9

Measured as standard uptake (SUV) (imaging modality)

Answer 9

PET

Question 10

HU for:
air 
water 
bone
lung

Answer 10

-1000
0
1000
-700

Question 11

Electron density for:
air 
water 
bone
lung

Answer 11

0
1
1.7
.3

Question 12

Energy is usually selected to cover the target with R90.
What does R90 equal?
R80?

Answer 12

R90 = Energy/4
R80 = Energy/3