Anatomy/Physiology
What are the 4 parts of the fallopian tubes?
Intramural, Isthmus, Ampulla, Infundibulum
Fimbriae (bonus +1)
What is the reason M-mode is used instead of Doppler, in 1st trimester?
Doppler has higher intensity and greater thermal bioeffect risk under ALARA; it is safer
What does ALARA stand for?
As Low As Reasonably Achievable
What 2 functions does the female reproductive system have?
Endocrine - produces estrogen & progesterone
Reproductive - produces the oocyte
Which weeks make up the 3rd trimester?
27-40
To prevent thermal bioeffects, output power should be set at ___.
<100%
What is implanted after fertilization, and where?
The blastocyst implants in the functional layer of the endometrium of the uterus, about 5–6 days after fertilization
Which obstetric study is performed between 11wk and 13wk 6d?
Nuchal Translucency
<1.9
These vessels are seen in the periphery of the uterus (basal zone) and shouldn't be mistaken for pathology.
Arcuate Vessels
Which obstetric study has the most images and is the most tedious?
Second-trimester anatomy/morphology ultrasound at 18–22 weeks
What is cavitation?
The creation, oscillation, and collapse of air bubbles
Which hormones are used to sustain pregnancy until the placenta is formed?
Progesterone from the corpus luteum sustains pregnancy;
hCG maintains the corpus luteum until the placenta takes over
This cardiac abnormality is better seen in the third trimester once the fetus is larger (demonstrated on the four-chamber view with color Doppler).
VSD - Ventricular Septal Defect
Which thermal index setting should be used before and after 8 weeks' gestation?
TI s = soft tissue (<8 weeks)
TI b = bone (>8 weeks)