BL Session 13 - Radiology Flashcards Preview

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Flashcards in BL Session 13 - Radiology Deck (7)
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1

Outline the biological effect of radiation, in deterministic terms. 

Effect includes:

- Erythema 

- Nausea

- Depilation and cataracts 

2

Outline the biological effect of radiation, in stochastic terms.

- Risks include DNA disruption resulting in cancer or hereditary disorders. 

- Risk is proportional to dose

3

Outline how one measures radiation. 

Measuring radiation:

 

- R – Radioactivity refers to the amount of ionising radiation released by a material.

- E – Exposure describes the amount of radiation travelling through the air.

- A – Absorbed dose describes the amount of radiation absorbed by an object or person.

- D – Dose equivalent or effective dose combines the amount of radiation absorbed and the medical effects of that type of radiation.

4

How is radiation dose measured?

- Absorbed dose – Gra (Gy)

- Dose equivalent – Sievert (Sv)

5

Sources of ionising radiation. 

- Natural – 2.4 mSv

I. Cosmic Rays

II. Plants

III. Our bodies

IV. Radon

V. Radioactive soil and rocks

 

- Artificial – 0.4 mS v

I. Medicinal

II. Chemicals

6

What are the MRI Contraindications?

- Cardiac pacemaker or implantable defibrillator

- Ferromagnetic intracranial aneurysm clip / FB

- Implanted or external medication pump

- Cochlear implant

- Neurostimulation system

- Catheter that has metallic components

7

Identify the different MRI Planes

 

- Axial

- Coronal

- Sagittal