US Flashcards
a measure of the potential of inducing a cavitation-related bioeffect with ultrasound.
MI (mechanical index)
the peak negative (rarefactional) pressure/SQRT (center frequency of the beam). Inversely proportional to the center of the beam frequency and will decrease with increasing freq
MI
Increasing the center of frequency will (increase/decrease) the mechanical index
decrease
an estimate of the increase in temperature within an insonated tissue as a result of tissue absorption of acoustic energy.
TI (thermal index)
the ratio of the acoustic power to the estimated acoustic power required to raise the tissue temperature by 1°C.
TI (thermal index)
US pixels have a depth of 8 bits (1 byte) of digital data, providing up to 2^8, that is, ____ levels of gray scale.
256
Ultrasound images are typically composed of ________ pixels.
640 × 480 or 512 × 512
MC predisposing factors for fournier gangrene
DM & alcoholism
Salvage rate of testicular detorsion performed after 12 hours.
~ 20%
~ 80% of undescended left testis are located
in the inguinal region. Most located caudal to the external inguinal ring
Patients with non-palpable cryptorchid testes should
undergo a diagnostic laparoscopy to identify and treat the malpositioned testes
Vascularity of the normal epididymis is (more/less) that the testes.
Less. Normally, flow may not necessarily be detectable on doppler.
MC initial site of metastatic dx for germ cell testicular tumors?
Retroperitoneal LNs.
Hematogenous spread to lungs, brain and liver can also occur
Presence of microlithiasis alone in absence of other risk factors (is/is not) indication for further sonographic surveillance or biopsy
is not
Focal hyperechoic thickening of the tunica albuginea of the corporoa cavernosa usually found in the dorsal surface of the penis. Dx?
Peyronie dx
