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Physics Ch 9
Ch 9 Exam
25
Physics
Undergraduate 2
03/14/2011

Additional Physics Flashcards

 


 

Cards

Term

 

Percent, Decibel, SPTA intensity, Mechanical index

 

 

Definition

 

Which of the following is (are) used currently to

indicate output on the display?

 

Term

 

 

Intensity at the transducer, Distance to the fetus, Frequency

 

 

 

 

Definition

 

Which of the following affect(s) exposure of a

fetus?

 

Term
False
Definition

 

There is no possible hazard involved in the use of

 diagnostic ultrasound.

 

Term
False
Definition
Ultrasound should not be used a a diagnostic tool because of the bioeffects it can produce
Term
100 mW/cm (squared) SPTA.
Definition

 

No independently confirmed, significant bioeffeets

in mammalian tissues have been reported at intensities

below

 

Term
No
Definition

Is there any known risk with the current use of diagnostic

ultrasound?

Term
Yes
Definition

Are there any bioeffeets that ultrasound produces in

small animals under experimental conditions?

Term
absorption, cavitation
Definition

Which of the following are mechanisms by which

ultrasound can produce bioeffects?

Term
Absorption
Definition
Which of the following relates to heating?
Term
None
Definition

Which of the following end points is documented

well enough in the scientific literature to allow a

risk assessment for diagnostic ultrasound to be

based on it?

Term
None
Definition

More than one epidemiologic study has shown a

statistically significant effect of ultrasound exposure

on which of the following end points?

Term
None
Definition

Which of the following acoustic parameters has

(have) been documented in ultrasound epidemiologic

studies published thus far?

Term
hydrophone
Definition

 A device commonly used to measure the ourput of

diagnostic ultrasound instruments is a(n)

Term
1 mW/cm (squared)
Definition

A typical output intensity (SPTA)for an ultrasound

imaging instrument is

Term
Duplex pulsed Doppler
Definition

Which of the following typically has the highffi

output intensity?

Term

There is no known risk with ultrasound imaging

as it is applied currently

Definition

As far as we know now, which of the following is

the most correct and informative response to a

patient's question. "Will this hurt me or my

baby?"

Term

Minimize exposure time, Scan for medical indication( s) only, Minimize exposure intensity

Definition

To minimize whatever risk there may be with ultrasound

imaging, which of the following should be

done?

Term
Transmit, output
Definition

Which of the following controls affect instrument

output intensity?

Term

Tissue anywhere in the Doppler beam is exposed

 to ultrasound, Tissue anywhere in the imaging plane is exposed

to ultrasound, Doppler intensities are higher than for continuous

wave fetal monitoring.

 

Definition

Which of the following are correct for a duplex,

pulsed wave Doppler instrument? 

Term
Fetus
Definition

The tissue of greatest concern regarding bioeffeets

in an abdominal scan is the

Term
No
Definition

Would it be wise to substitute a duplex, pulsed

wave Doppler device for an inoperative fetal monitor for long-term (e.g., 24-hour) monitoring

in labor?

Term
Patient
Definition

Which of the following is (are) likely to be exposed

to ultrasound during a diagnostic study?

Term
2
Definition

No bioeffeets have been observed in nonhuman

mammalian tissues at thermal index values of less than

Term
0.3
Definition

No bioeffecls have been observed in nonhuman

mammalian tissues at mechanical index values of

less than

Term
0.3
Definition

No bioeffects have been observed in nonhuman

mammalian tissues at peak rarefactional pressure

values (megapascals) of less than

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