Week 3 Introduction to Medical Imaging Flashcards Preview

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

How does radiography work?

A

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
Q

What are benefits of radiogrpahy (2)?

A

fast, great resolution

3
Q

what are the limitations of radiography? (2)

A

poor tissue contrast, radiation

4
Q

how does CT work? what does CT stand for?

A

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
Q

how does radiography show tissue differences?

A

different electron density

6
Q

how does CT scan show tissue differences?

A

different attenuation of X-rays relative to water

7
Q

what is a benefit of the CT scan?

A

has very good contrast (all tissue densities show up)

8
Q

what are some negatives of the CT?

A

huge amount of radiation

9
Q

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

A

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
Q

what type of energy does MRI use?

A

radiofrequency waves

11
Q

how does MRI show tissue differences

A

different rates of nuclear relaxation

12
Q

what are benefits to MRI (2)?

A

best tissue contrast. no radiation

13
Q

what are some limits to MRI (3)

A

slow, expensive, magnet danger

14
Q

how does ultrasound work?

A

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

15
Q

what type of energy does ultrasound use?

A

sound waves

16
Q

how does ultrasound show tissue differences?

A

different acoustic impedance

17
Q

what are 2 benefits of ultrasound?

A

real time imaging, no radiation

18
Q

what are two limits to ultrasound?

A

user dependent, many artifacts

19
Q

how does nuclear medicine work?

A

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

20
Q

what is the source of energy in nuclear medicine?

A

gamma-rays

21
Q

how does nuclear medicine show tissue differences?

A

different levels of radioactivity

22
Q

what is the benefit to nuclear medicine?

A

see physiology and pathophysiology in action

23
Q

what are two limitations to nuclear medicine?

A

worst resolution, radiation

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