Magnetic resonance angiography
Magnetic resonance angiography (MRA) is a group of techniques based on magnetic resonance imaging (MRI) to image blood vessels. Magnetic resonance angiography is used to generate images of arteries (and less commonly veins) in order to evaluate them for stenosis (abnormal narrowing), occlusions, aneurysms (vessel wall dilatations, at risk of rupture) or other abnormalities. MRA is often used to evaluate the arteries of the neck and brain, the thoracic and abdominal aorta, the renal arteries, and the legs (the latter exam is often referred to as a "run-off").
Acquisition
A variety of techniques can be used to generate the pictures of blood vessels, both arteries and veins, based on flow effects or on contrast (inherent or pharmacologically generated). The most frequently applied MRA methods involve the use intravenous contrast agents, particularly those containing gadolinium to shorten the T1 of blood to about 250 ms, shorter than the T1 of all other tissues (except fat). Short-TR sequences produce bright images of the blood. However, many other techniques for performing MRA exist, and can be classified into two general groups: 'flow-dependent' methods and 'flow-independent' methods.
DPC
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Podcasts:
It'll Never Be The Way It Was Before
by: DpcIt'll never be the way it was before
And life, it couldn't change anymore
It'll never be the way it was before
Ooh, and I don't want it to change
It'll never be the way it was before
And life, it couldn't change anymore
It'll never be the way it was before
Ooh, and I don't want it to change
It'll never be the way it was before, no, no
Ooh and life, well it couldn't change anymore, no, no
Oh it'll never be the way it was before, no, no
No oh and I, don't want it to change, no, no
Time is going round
And it's too late to slow down, yeah
Ooh and the night's already here
And i'm supposed to be done, yeah, yeah
The love we had back then
It will not be again, no, no
Oh but the future's looking bright
So it might return, yeah, yeah
Life is going wrong
And you've been gone too long, yeah, yeah
But i've still got my mind
And the years are young, yeah, yeah
I really miss the touch of your hand
I think you understand, yeah, yeah
Oh well but I (oh well but I)
Do not want it to fade (no, no, no, no, I)
No it'll never be the way it was before, no, no
And life keeps moving on
And it can't change anymore, no, no
No way
It will never ever be the way it was before (no, no, no, no, I)
Oh well and I (oh well but I)
I do not want it to change ( no, no, not again, no, no)
Memories of the past
Well they were such a blast, yeah, yeah
But life gets in the way
And they just go too fast (way too fast)
So now it'll never be the way
The way it was before (oh no)
oh well, then I (oh well, farewell)
I still don't want it to change, no, no
And it'll never be the way it was before
And life it couldn't change anymore
No, it'll never be the way that it was before
And I know I don't want it to change
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