Ch 6b Quality Control/Phantoms

Question 1

What are the quality control tissue phantoms made of?

Answer 1

Graphite filled aqueous gels OR urethane rubber materials

Question 2

Graphite particles in the tissue phantoms act as what in materials?

Answer 2

U/s scatterers (echo producers) in materials

Question 3

Is attenuation in the tissue phantom materials similar to soft tissue?

Answer 3

Yes - propagation speed in 1.54 mm/microsecond in gels

Question 4

Tissue equivalent phantoms typically contain what 2 things?

Answer 4

-Echo free (cystic) regions of various diameters + thin nylon lines (approx 0.2mm in diameter)

-Used to measure detail resolution + distance accuracy

Question 5

Tissue equivalent phantoms simulate tissue properties which allow us to assess what 4 things?

Answer 5

-Detail + contrast resolutions
-Penetration
-Dynamic range
-TGC operation

Question 6

Do test objects simulate tissue characteristics?

Answer 6

No!

Question 7

What do test objects provide, since they do not simulate tissue characteristics?

Answer 7

Some specific measure of instrument performance

Question 8

What 2 things do test objects contain + why?

Answer 8

-Nylon lines + scattering layers
-To allow evaluation of detail resolution + beam profiles

Question 9

Doppler flow phantoms use what kind of liquid?

Answer 9

A flowing blood mimicking liquid

Question 10

Doppler flow phantom devices are useful for testing what 4 things?

Answer 10

-The effective penetration of the doppler beam
-Ability to discriminate b/w different flow directions
-Accuracy of sample volume location
-Accuracy of the measured flow speed

Question 11

Doppler test objects use what to scatter the
u/s?

Answer 11

A moving solid object (usually a string) for scattering the u/s

Question 12

How many devices can measure the acoustic output of u/s instruments?

Answer 12

Several

Question 13

Devices used to measure the acoustic output are normally used by what people?

Answer 13

Engineers + physicists (rather than by instrument operators)

Question 14

What is another word for the hydrophone?

Answer 14

Microprobe

Question 15

What device is m/c used to test acoustic output?

Answer 15

The hydrophone/microprobe

(dustin says this is a test question)

Question 16

In response to the varying pressure of sound when measuring acoustic output, they produce a varying voltage that can be displayed on what?

Answer 16

An oscilloscope

Question 17

Have acoustic pressure output levels been measured + intensified, as well have output indexes been calculated for various diagnostic u/s instruments + transducers?

Answer 17

Yes

Question 18

Are anatomic imaging outputs highest or lowest?

Answer 18

Lowest

Question 19

Are pulsed spectral doppler outputs highest or lowest?

Answer 19

Highest

Question 20

Where does M-Mode + CD imaging outputs fall in regards to anatomic imaging + pulsed spectral doppler?

Answer 20

Falls b/w anatomic imaging + pulsed spectral doppler

Question 21

Needle + membrane hydrophones are used to measure what?

Answer 21

Pressure amplitude + period

(from which several other acoustic pulse parameters can be calculated)

Question 22

When is leakage testing done?

Answer 22

During disinfection

Question 23

How to leak test a TEE probe?

Answer 23

-Attach TEE probe adapter to leakage tester
-Connect probes electrical connector to matching leakage tester adapter + lock in place
-Place leakage testers dual electrode in solution to a depth of at LEAST 1 inch
-Check solution for conductivity + perform leakage testing by pressing the full test button
-Document results (log pass or fail)
-If failed, follow facility’s guidelines + contact probe manufacturer for servicing
-Test different TEE probe to ensure leakage tester is working correctly

Question 24

List the 4 steps in leakage testing based off the video?

Answer 24

1. fill soak tray
2. connect equipment (use either port)
3. insert probes into soak tray
4. turn on ULT-2020 (press full test + wait for results)