Provides an overview of radiation and CT use in pregnancy including indications and clinical scenarios. Presentation material taken from journals with overall theme based on lecture by Elliot K. Fishman, MD.
Based on switching around numbers, you end up with 2% getting cancer because of a CT. Ludacris. You’re making this assumption based on extrapolation from the Hiroshima event. Hiroshima was a unique experience, it’s not like getting a CT. There are many different doses. We irradiated a population that was very ill. The average person in Japan was malnourished. Radiation effects on a malnourished population are significantly different than the effects on a healthy population but that’s never really looked at.
Effective does is a very important concept.People take effective dose and they turn that into people getting cancer and what happens with an individual patient. You have to be careful what numbers mean.Estimates are derived from simulation models.
People take effective dose and they turn that into people getting cancer and what happens with an individual patient. You have to be careful what numbers mean.Estimates are derived from simulation models.
The sievert (symbol: Sv) is the SI derived unit of dose equivalent. It attempts to reflect the biological effects of radiation as opposed to the physical aspects, which are characterised by the absorbed dose, measured in gray. It is named after Rolf Sievert, aSwedish medical physicist famous for work on radiation dosage measurement and research into the biological effects of radiation.The röntgen (roentgen) equivalent in man (or mammal) or rem (symbol rem) is a unit of radiation dose equivalent. It is the product of the absorbed dose in rads and a weighting factor, WR, which accounts for the effectiveness of the radiation to cause biological damage.1 rem = 0.01 SvRad = dose causing 0.01 joule of energy to be absorbed per kilogram of matter.
There are many reasons for acute abdomen. Give lots of oral, wait 90 – 120 minutes and you can
Cecum and distal bowel are well filled.
Placenta enhancing, very bright, homogeneous. Fetus in place with fluid in the uterine cavity
Placenta, bright, fairly homogeneous enhancement
Extensive acute central PE with “saddle embolus” extending into both central pulmonary arteries in a 72-year-oldman. Contrast material–enhanced 16–detector row CT yielded coronal volume renderings in (a) anterocranial and (b) anteriorperspectives, which allow intuitive visualization of the location and extent of embolus (arrows).
Three-dimensional reconstructed CT scan image of a ureteral stent (left kidney, indicated by yellow arrow) in a 26-year-old male. There is a kidney stone in the pyelum of the lower pole (highest red arrow) and one in the ureter beside the stent (lower red arrow).
Look at the placenta, see the mild enhancement. It’s abnormal. There’s some bleeding in the abdominal wall. Rupture, injury to placenta. Monitored 12-13 hours, kid went into distress and required c-section. 36 weeks gestation.
Coronal views of same patient – placenta abruptia – critical example of how a CT allowed to make a very specific diagnosis