0:00

So the scatter to primary ratio is typically

0:05

0.3 to 0.5. In an uncompromised breast,

0:09

it's 0.8 to one. In a compressed breast, it's

0:12

0.3 to 0.5.

0:15

The scatter radiation can degrade the image contrast.

0:18

That's why we use. And the grid is one thing which we use

0:22

to reduce the scatter,

0:25

and that also can increase the patient dose.

0:29

So the typical grid ratio is four is to one or five is to

0:32

one,

0:33

and the bucky factor is two to three.

0:35

So with the utilization of the bucky factor with the grid,

0:39

the radiation dosage is higher by twice or three times.

0:43

Then the line pair used for this particular grid is 60 to 80

0:47

lines per centimeter.

0:49

So the scatter radiation, in order to reduce, we use grid,

0:54

but grid has a disadvantage. It increases the radiation dose to the

0:58

patient, but that is also utilized to improve the image

1:01

quality. I'm going to repeat this one.

1:04

So scatter radiation in mammography or in radiography or

1:08

any imaging modality is actually a culprit to

1:12

decrease the image quality. We use multiple methodology to reduce

1:16

scatter radiation. One simple way is inserting a

1:20

grid between the object we are imaging, such as breast

1:24

and the digital detector or an analog detector.

1:27

And this grid we discussed earlier, the ratio is typically

1:31

four is to one or five is to one because the distance from

1:35

the X-ray tube to the image is much smaller

1:39

compared to radiography. And that's why in radiography, we use eight

1:43

is to one grid, and in chest radiography, we use 12 is to

1:47

one grid, and so forth.