SR2 Intro

Question 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

Answer 1

Bone scan (Bone scintigraphy)

Question 2

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

Answer 2

Technetium Tc 99m

Question 3

Name a couple things that bone scans are useful in determining

Answer 3

• acute fracture
• stress fracture
• metastasis
• infection
• Paget’s disease
• child abuse

Question 4

What does PET scan stand for?

Answer 4

Positron Emission Tomography

Question 5

Name a couple things PET scans are good for

Answer 5

• detecting cancer
• detecting coronary heart disease
• detecting brain disorders (Parkinson’s, Alzheimer’s)

Question 6

What does CT scan stand for?

Answer 6

Computed Tomography

Question 7

Does a CT scan use ionizing radiation?

Answer 7

Yes

Question 8

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

Answer 8

CT scan

Question 9

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

Answer 9

0-3 days

Question 10

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

Answer 10

DEXA

Question 11

What is the name for DEXA “Scores”

Answer 11

T score

Question 12

For DEXA, what is a T score measuring?

Answer 12

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

Question 13

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

Answer 13

• 1 to -2.5 = osteopenia

- 2.5 and lower = osteoporosis

Question 14

What is the atom of choice for an MRI?

Answer 14

Hydrogen

Question 15

In an MRI, is cortical bone black or white?

Answer 15

Black

Question 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

Answer 16

1,000

Question 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

Answer 17

20

Question 18

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

Answer 18

1,000 and 100

Question 19

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

Answer 19

T1-Weighted

Question 20

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

Answer 20

T2-Weighted