Radiation medicine
-
We describe a patient who had a dural arteriovenous fistula of the cavernous sinus with cortical venous reflux into the lateral mesencephalic vein and cerebellar hemispheric veins via a bridging vein connected with the basilar plexus. The fistula and reflux disappeared after transvenous embolization using interlocking detachable coils.
-
A patient with breast cancer received radiation therapy to the upper chest wall. Twenty-two years later, she presented with repeated severe bleeding through a left lower neck ulcer. ⋯ To manage for explosive carotid blowout, we performed common carotid artery ligation and endovascular coil embolization after contralateral-external-carotid to ipsilateral-common-carotid artery bypass with a polytetrafluoroethylene (PTFE) graft. The patient has experienced no ischemic events or bleeding since this treatment.
-
Combined abdominal and pelvic helical computed tomography (CT) with intravenous contrast media was performed on 19 patients with 400 mL of diluted iodine solution 60 minutes before and 400 mL of water just before CT. The distal small bowel was opacified by the positive contrast agent, and the stomach by the negative contrast agent in all patients. ⋯ There were no pseudotumors. Thus our protocol, first diluted iodine solution and second water, can be used as a method for the oral administration of contrast agents for combined abdominal and pelvic helical CT with intravenous contrast media.
-
Comparative Study
The value of fast and ultrafast T2-weighted MR imaging sequences in hepatic enhancement with ferumoxides: comparison with conventional spin-echo sequence.
The efficacy of superparamagnetic iron oxide (SPIO) was evaluated with fast T2-weighted imaging sequences such as turbo spin-echo (TSE), half-Fourier single shot turbo spin echo (HASTE), and echo-planar imaging (EPI) in comparison with the conventional spin-echo (SE) sequence on a 1.5 Tesla MR unit. ⋯ Although TSE sequences and HASTE sequences are less susceptible to magnetic field inhomogeneities than SE and EPI sequences, the decrease in liver signal on HASTE and TSE sequences was comparable to that on EPI and SE sequences, respectively. These sequences are useful clinically for ferumoxides imaging, because they are less sensitive to motion artifacts.
-
The purpose of this study was to evaluate the accuracy of T2 calculation from single shot imaging sequences such as echo-planar imaging (EPI) and half-Fourier single shot turbo spin-echo (HASTE) imaging. ⋯ With single shot sequences, it is possible to obtain the T2 values that show excellent correlation with the CPMG sequence. Although both HASTE and EPI are useful to calculate T2 values, EPI appears to be more accurate in characterizing focal liver lesions.