0:01

So I'm going to show you a case of multi-phase imaging,

0:06

and we'll talk a little bit about the acquisition

0:09

and also the point of the acquisition method.

0:18

So this was obtained retrospectively gated.

0:24

It's low pitch, somewhere around 0.25.

0:28

7 00:00:29,540 --> 00:00:36,910 And the purpose was to assess aortic valve motion.

0:38

And therefore, we wanted to get the aortic

0:41

valve, aortic annulus, which is this plane here.

0:46

We ended up getting a little bit of a ventricle.

0:49

So the first thing is that you can work this out

0:53

like a standard sequence and play around with it

0:57

until you get the cardiac planes that you want.

1:02

And I'm just going to demonstrate

1:04

the short axis plane here.

1:07

And the other thing you can do

1:09

is you can play a cine loop.

1:14

And that's what I'm doing over here.

1:17

And so I can look at wall motion, I

1:21

can look for function, wall thinning,

1:24

and aneurysms and stuff like that.

1:27

So this, in particular, this study was acquired

1:31

retrospectively, and for all positions of the heart,

1:36

such as this position here, we have information

1:40

throughout the cardiac cycle, and we reconstruct

1:43

at certain intervals, such as 5% or 10%.

1:46

Here we are reconstructing at 5%

1:50

intervals, and so, like this anterior wall

1:56

here, we have information in all the phases.

2:02

This is how we used to do all our coronaries in

2:05

the past, because we were worried that we didn't

2:08

get the right data, that we might need another

2:12

phase to look at another portion of the heart.

2:15

That's now being supplanted by various forms

2:19

of what almost approaches perspective imaging.

2:26

And instead, we use this when we need multi

2:30

phase data, such as of the valve here.

2:33

So this is a nice three-dimensional

2:37

cross-sectional view of the valve.

2:40

And we can now look at the valve.

2:42

Here it is systole.

2:44

The valve opens, but may not open

2:48

as much as we would want it to open.

2:51

Stenosis.

2:53

And here is diastole.

2:54

And in diastole, the valve is closed.

2:57

And you can see that there is nice closure.

3:00

There is good acquisition.

3:03

So this particular study was done as a planning

3:08

for pre-TAVR, which is a way of placing a valve

3:14

endovascularly, a very popular method at the moment.

3:18

We end up choosing the best phase that shows us

3:21

the annulus with the least amount of motion so that

3:25

we can select that for our measurement purposes.

3:28

Thank you.