US Flashcards
what is the avg velocity of sound wave through soft tissue?
1540
T-F–denser mediums transmit sound waves at a slower velocity?
false- faster
T-F lower frequency sound waves penetrate less, but provide more resolution due to their longer wavelength?
false- long wavelength, but opposite is true
Higher frequency waves have better resolution, but less penetration.
when the densities are very different, there is poor transmission and almost complete reflection of the sound waves–what happens
a bright white line forms and an anechoic area beyond forms which is known as shadowing
notch on transducer faces the patients what?
head or to the right
review things we can assess with the gallbladder?
Size (varies w/ prandial state), shape Wall thickness Pericholecystic fluid Stones (size, mobility, shadowing) Dilated ducts Sonographic Murphy’s sign- sensitivity and specific for cholecystitis, but often already had pain meds and it confuses the findings.
how do we tell the difference between the portal vein and the common bile duct?
vein has more fat around it
Do you need to be NPO for gallbladder US?
npo for 4 hours
T-F- normally the liver is slightly more echogenic than the kidney?
true
CT or MR better in the liver?
MR
Review the reasons why we use US for kidneys?
Work-up hematuria: Rule out mass
Hypertension: eval for RAS (renal artery stenosis)
Renal failure (acute or chronic)
Recurrent UTI’s: eval for Hydronephrosis
Complications of pyelonephritis – 75% of cases of pyelonephritis have normal US scans.
Us demonstrating a red doppler in the bladder means what?
ureteral jet
What is the bright white part after a cyst called?
through transmission
what runs right under and intimate with the pancreas?
splenic vein- thrombosis with pancreatitis.
what do we use US for in the thyroid?
Masses/Goiter
Hyperthyroidism
Graves’ Disease
Hashimoto’s thyroiditis
Biopsy
