SR2 Intro Flashcards Preview

Skel Rad > SR2 Intro > Flashcards

Flashcards in SR2 Intro Deck (20):
1

This type of imaging is used as a complement to radiography, is helpful for determining areas of metabolic activity, and is very sensitive, but not specific

Bone scan (Bone scintigraphy)

2

In a bone scan, what radioactive tracer is the patient injected with?

Technetium Tc 99m

3

Name a couple things that bone scans are useful in determining

-acute fracture
-stress fracture
-metastasis
-infection
-Paget's disease
-child abuse

4

What does PET scan stand for?

Positron Emission Tomography

5

Name a couple things PET scans are good for

-detecting cancer
-detecting coronary heart disease
-detecting brain disorders (Parkinson's, Alzheimer's)

6

What does CT scan stand for?

Computed Tomography

7

Does a CT scan use ionizing radiation?

Yes

8

This type of imaging modality is useful for fine bony detail, cortical bone, and looking at things in the chest and abdomen

CT scan

9

If a patient has head trauma, how many days from injury would it still be wise to get a CT scan?

0-3 days

10

This type of imaging modality is currently the most widely used method to measure bone mineral density

DEXA

11

What is the name for DEXA "Scores"

T score

12

For DEXA, what is a T score measuring?

The amount of bone compared to a young adult, same gender, with peak bone mass

13

In a T score, scores above -1 are considered normal. Give the score ranges for osteopenia and osteoporosis diagnoses

-1 to -2.5 = osteopenia
-2.5 and lower = osteoporosis

14

What is the atom of choice for an MRI?

Hydrogen

15

In an MRI, is cortical bone black or white?

Black

16

In an MRI, time between radiofrequency pulses is measured and determines whether it is a T1 or T2 Weighted image. In order for it to be a T1 W image, the repetition time must be less than ____ msec

1,000

17

In MRI, there is also another measurement called Echo Time. It is the time between RF pulse and the measurement of energy released. In a T1 image, the echo time would be less than ___msec

20

18

In a T2 Weighted Image (MRI), repetition time would be greater than ___msec, and echo time would be greater than ___msec (usually)

1,000 and 100

19

For MRI, this type of weighted image shows fat as the brightest signal, and water is dark (such as CSF)

T1-Weighted

20

For MRI, this type of weighted image has both bright fat AND water.

T2-Weighted