Med phys (1 Viewer)

[ND]

"perform an investigation to compare the image of a bone scan with an x-ray image"

How do we compare the two? I've never seen a bone scan, can anyone help me?

Btw, what is this dotpoint:

"that are used to obtain scans of organs"

Yep, no typo, that's actually what it says... wtf...


edit: nevermind, got some info.

 

[helper]

Full dot point
outline properties of radioactive isotopes and their half lives that are used to obtain scans of organs

Bone scans are completed using radisotopes. The radiosotope emits radiation, which is then detected by an x-ray detector.
Looking at emission of x-rays
Takes 3-4 hours
Provides more detail than an x-ray
With a bone scan it is possible to detect early changes in the spine and/or other bones of the body which might not show up on an x-ray.
Eg http://www.nass.co.uk/pics/bonescan.jpg

X-rays
Absorption of x-rays shown.
Almost instaneous.

Also may talk about radiation dosages and more detail on x-rays.

 

[ND]

Thanks. You really live up to your name.

 

[helper]

http://www.rctradiology.com/nuclearmedicine.html
or
http://www.csosortho.com/spinediagnosis.html

Show some comparisons.

Particulary note the hot spots that show up on bone scans not on x-rays

 

[Inhuman]

err... you said that the isotopes radiation is picked up by X-ray detectors. A

As far as I know the isotopes emit gamma radiation which is then detected by a gamma camera

Also isotope scans can do organs too which X-rays can't, and the resolution isn't as good as X-rays

 

[helper]

Depends on which source you take. Modern detectors use a gamma cameras.

Some of the older methods used x-ray plates.

So the answer using a gamma camera would be a better answer.

 

[Gruma]

theres a good comparison in the maquarie revision book.

 

[Inhuman]

You really know your stuff Helper