SR2 Intro Flashcards
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)
In a bone scan, what radioactive tracer is the patient injected with?
Technetium Tc 99m
Name a couple things that bone scans are useful in determining
- acute fracture
- stress fracture
- metastasis
- infection
- Paget’s disease
- child abuse
What does PET scan stand for?
Positron Emission Tomography
Name a couple things PET scans are good for
- detecting cancer
- detecting coronary heart disease
- detecting brain disorders (Parkinson’s, Alzheimer’s)
What does CT scan stand for?
Computed Tomography
Does a CT scan use ionizing radiation?
Yes
This type of imaging modality is useful for fine bony detail, cortical bone, and looking at things in the chest and abdomen
CT scan
If a patient has head trauma, how many days from injury would it still be wise to get a CT scan?
0-3 days
This type of imaging modality is currently the most widely used method to measure bone mineral density
DEXA
What is the name for DEXA “Scores”
T score
For DEXA, what is a T score measuring?
The amount of bone compared to a young adult, same gender, with peak bone mass
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
What is the atom of choice for an MRI?
Hydrogen
In an MRI, is cortical bone black or white?
Black
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
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
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
For MRI, this type of weighted image shows fat as the brightest signal, and water is dark (such as CSF)
T1-Weighted
For MRI, this type of weighted image has both bright fat AND water.
T2-Weighted
