Lecture 1B P2 Flashcards
Transvaginal probe is ____Mhz
5-10
Transvaginal used in both ______ and _____ pregnancies to assses ______
Late and early pregnancy
Assess cervix
Transperineal and translabial probes can be used for
Less intrusive procedure, useful info in later pregnancies
The request for the exam of OB US must come from
Delegated individual :
Physician
Obstetrician
Midwives
What does ALARA meaning when scannign
As low as reasonably achievable
Two things that contribute to patient exposure and need to be minimized
Output intenstiy
Exposure time
Minimizing output intensity:
Appropriate quality control to maintain appropriate output setting on US equipment Reducing power setting on machine Using doppler (higher intensity as necessary)
Minimizing exposure time:
Only when medically necessary
Perform exams as efficiently as possible
Minimize repeat examinations
Explain thermal abioeffects
Some US energy is absorbed by tissure causing an increase in temperature rise of tissye
Heat can affest
Chemical reactions and molecular bonds
What is teratogen
Agent causing malformation of embryo
What is the thermal index
A measurement of ultrasounf conditions that can change the temperature of a tissue
_____ to _____ is the threshould for potentially hazardous conditions
1.5-2 degrees celcius
TI=1 means
The tissue may increase in temp of 1 degree celcius
TI s means and when is it seen
Soft tissue
<8 weeks
