Lecture 6 P2

Question 1

Describe spatial compounding in pre-processing

Answer 1

Hit the same object from different angle and average the images —> trying to average out to hit the structure at 90 degrees

Question 2

What are the benefits of spatial compounding

Answer 2

Clear out cysts

Sharpen borders

Question 3

What is fusion imaging in the pre-processing

Answer 3

Averaging out the frames created using all the different frequencies

Question 4

Describe persistence is pre-posting

Answer 4

Averaging of sequential frames in time

Aka frame averaging

Question 5

Advantages to persistence

Answer 5

Reduces noise (speckle) and random content

Question 6

Is persistence automatic?

Answer 6

No operator controlled

Question 7

What happens to frame rate with use of persistence

Answer 7

Decrease in frame rate

Question 8

3D imaging in Preprocessing

Answer 8

Multiple parallel 2D frames obtained and built into 3D volume

Aka volume imaging/ volumetric imaging

Question 9

Why is fusion imaging beneficial

Answer 9

Use high freq for near field resolution and low freq far larger depths

Question 10

4D imaging=

Answer 10

3D imaging + time

Question 11

What is elastography in pre-processing

Answer 11

Elastography is an imaging method that presents qualitative tissue stiffness information on the anatomic display and, in some cases, presents quantitative stiffness info

Question 12

Compressibility in elastography has a correlation with

Answer 12

Malignancy potential

Question 13

How is elastography viewed

Answer 13

Split screen is used

Colour side display shows compressibility

Question 14

Summary of pre processing

Answer 14

All processing functinos involved before frames are placed in memory
They are all live scanning options

Pre-processing functions cannot be done after pressing freeze

Question 15

Can post processing be done on froze nimage

Answer 15

Yes

Question 16

What is post processing

Answer 16

Involves processing done to an image after it is pulled from the image memory

Question 17

Is black-echo/ white echo part of post processing

Answer 17

Yes

Question 18

2 more post processing functions

Answer 18

B- colour and cutting up 3D image

Question 19

Human eye can see ____ shades of grey and ______ shade of colour

Answer 19

100

256

Question 20

Read magnification funciton of post processing

Answer 20

Pulls out specific pixels from the frame from memory nad displays them using the entire display

Question 21

Read magnification aka

Answer 21

Read zoom

Question 22

Drawback of read magnification

Answer 22

Pixelization —> enlargement of pixels

Question 23

PRE PROCESSING write magnification

Answer 23

Smaller field of view written using the pixels for the entire frame

Better resolution

Changing depth is a similar function

Question 24

Write magnification aka

Answer 24

Write zoom