Week 3 Introduction to Medical Imaging Flashcards Preview

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Flashcards in Week 3 Introduction to Medical Imaging Deck (23):
1

How does radiography work?

X-rays are shot through a body part, but only some make it through (based on electron density). The ones that do are captured on the other end and recorded as an image

2

What are benefits of radiogrpahy (2)?

fast, great resolution

3

what are the limitations of radiography? (2)

poor tissue contrast, radiation

4

how does CT work? what does CT stand for?

Computed tomography. makes use of computer-processed combinations of many X-ray images taken from different angles to produce cross-sectional (tomographic) images (virtual "slices") of specific areas

5

how does radiography show tissue differences?

different electron density

6

how does CT scan show tissue differences?

different attenuation of X-rays relative to water

7

what is a benefit of the CT scan?

has very good contrast (all tissue densities show up)

8

what are some negatives of the CT?

huge amount of radiation

9

How does an MRI work? what does MRI stand for/

Magnetic resonance imaging. essentially a huge magnetic sends a signal to the nucleus and then the rate at which the nuclei of different tissues is recorded.

10

what type of energy does MRI use?

radiofrequency waves

11

how does MRI show tissue differences

different rates of nuclear relaxation

12

what are benefits to MRI (2)?

best tissue contrast. no radiation

13

what are some limits to MRI (3)

slow, expensive, magnet danger

14

how does ultrasound work?

a sound signal is sent, bounces of objects, and is recorded. (dolphins, sonar)

15

what type of energy does ultrasound use?

sound waves

16

how does ultrasound show tissue differences?

different acoustic impedance

17

what are 2 benefits of ultrasound?

real time imaging, no radiation

18

what are two limits to ultrasound?

user dependent, many artifacts

19

how does nuclear medicine work?

radioactive material is taken in and then a special camera takes pictures of the material inside your body

20

what is the source of energy in nuclear medicine?

gamma-rays

21

how does nuclear medicine show tissue differences?

different levels of radioactivity

22

what is the benefit to nuclear medicine?

see physiology and pathophysiology in action

23

what are two limitations to nuclear medicine?

worst resolution, radiation

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