Direct measurement of CTDI on helical CT scans.

Purpose: Medical physics computed tomography (CT) practice involves measurements to determine CTDI on representative clinical CT protocols. In current practice the majority of CT exams employ helical scans. To determine CTDI for a helical scan, one measures CTDI with an axial scan, then divides by the pitch.

Half Century Since SIDS: A Reappraisal of Terminology.

After a sudden infant death, parents and caregivers need accurate and open communication about why their infant died. Communicating tragic news about a child's death to families and caregivers is difficult. Shared and consistent terminology is essential for pediatricians, other physicians, and nonphysician clinicians to improve communication with families and among themselves.

"Effect of very dense artifacts on Hologic and general electric bone densitometry results".

Unlabelled: Very dense artifacts confound bone density measurement. Hologic and GE densitometers exclude artifact density and GE also excludes associated area. Consequently, BMD is decreased with Hologic software.