Virtual colonoscopy CAD improves flat-lesion detection June 5, 2009 -- Computer-aided detection (CAD) software can improve the detection of flat lesions at virtual colonoscopy -- as long as the lesions are at least 1 mm high. In a new study from Italy, CAD detected 94% of all flat lesions; however, radiologists dismissed a few of them incorrectly as false positives.
MRA planning halves radiation, contrast dose during UAE May 28, 2009 -- German researchers have found that performing an MR angiography (MRA) scan for planning prior to uterine artery embolization (UAE) can cut both radiation and contrast dose in half, according to a study published in the June issue of Radiology.
Audio and visual aids decrease radiation therapy treatment times May 19, 2009 -- Use of respiratory-gating techniques during free breathing reduces healthy tissue exposure to radiation, but has the drawback of longer radiation therapy delivery times. Belgian researchers may have found a solution in an inexpensive, low-tech technique: At their center, visually guided voluntary breath-hold along with audio assistance reduced treatment time duration so that it's comparable to conventional treatment times.
Two lung CAD systems unaffected by low dose May 11, 2009 -- A face-off between two lung nodule computer-aided detection (CAD) systems found a big difference in sensitivity for detecting solid pulmonary nodules, but it also revealed the good news that nodule detection was unaffected by low-dose scanning. The number of false positives also differed significantly between the two systems, researchers from Germany reported.
VC not cost-effective in FOBT-positive screening population May 8, 2009 -- Patients with positive screening results on fecal occult blood tests (FOBTs) should probably head straight to optical colonoscopy for their next exam, according to a new study from the Netherlands. Virtual colonoscopy may not be cost-effective in this population because so many FOBT-positive patients would need referral for polypectomy anyway, the researchers said.
FFDM equals analog mammography in hard-copy reading May 7, 2009 -- A new study from the U.K. confirms previous research regarding the equivalency of full-field digital mammography (FFDM) with analog film-screen mammography. The two techniques had roughly equal detection rates when images were printed and read in a hard-copy environment.
Biological dose measures promise new view of cardiac imaging risk May 1, 2009 -- The development of biological radiation dose measurement portends a future of far greater accuracy in gauging the damage wrought by ionizing radiation in imaging exams. Two studies, focused on cardiac CT and conventional angiography exams, respectively, offer the potential of maximizing image quality while minimizing the potential radiation risk to the patient.
US replaces x-ray for diagnosing childhood constipation April 27, 2009 -- British pediatricians at a London children's hospital are using ultrasound to assess the severity of constipation in children. They have found that ultrasound is a good substitute for abdominal x-ray, with its radiation exposure, or a digital rectal examination, a procedure that children find unpleasant and disturbing.