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This patient is being prepared to undergo a SPECT procedure
to look at myocardial profusion,
that is, blood supply to the heart muscle.
It's usual to scan the patient to look at the profusion
when the heart is being stressed and also when the heart is rested.
There can be several days between these two image acquisitions.
Stressing of the heart is achieved in two ways,
first by a pharmaceutical which has a similar effect on the heart
to taking exercise.
And also by squeezing a dumbbell.
The heart needs to monitored carefully during this period,
so an ECG is recorded.
This is the bit that allows us to see –
take some pictures and see what's going on.
Once the heart has been stressed, the radiopharmaceutical is injected.
In this case,
the pharmaceutical being used is Technetium-labelled Tetrofosmin.
Okay?
That's that part of the test finished now, Mr Park,
so I'm just going to disconnect you from all of the machinery
and then I'm going to ask you to wait in the waiting room,
because it takes this isotope up to an hour to reach your heart.
And then I'll come and collect you and escort you through for your scan,
okay?
Hello, Geoff, this is Mr Park.
Mr Park, this is Geoff, and Geoff will be doing your scan,
- so I'll hand you over, okay? - Thank you very much.
If you'd like to lie on this bed, on your back, for me,
with your feet up this end and your head on the pillow just up there.
Alright?
I need you to put your arms just above your head for me now,
just on either side of you, and that one as well.
In order to obtain thermographic images,
two gamma cameras must be rotated around the patient,
as close as possible to the heart,
and the cameras are now trained to move around the patient
as closely as possible without touching him.
The computer will now calculate...
and teach this camera head just to move in.
Keep very still...
I'll go and start the positioning.
The images are reconstructed from the data,
using the same back projection techniques
that are used in CT scanning.
They're shown as slices through the heart in different directions,
with the white part of the image corresponding to high take-up
of the radiopharmaceutical,
and the blue part representing low take-up.
Right, that's it, we're all finished now, you can relax.
We will be doing some pictures of your heart when it's at rest,
and that will be later on.
We'll give you all the details about when we're going to do that
in about ten minutes or so,
but first of all I'm going to check the data.
Have a seat in the waiting room where you were before.
Right.
And I'll come and let you know.
Thank you.
- bye bye for now. - Bye.
Right, here we have some processed images,
and we're looking at the stress and rest in the short axis,
stress and rest in the horizontal long axis,
and stress and rest in the vertical long axis.
And what we're now going to do
is compare isotope distribution in the stress images and the rest images,
looking for reversible or irreversible defects.