Validity of computed tomography in predicting scaphoid screw prominence: a cadaveric study.

Background: Studies of hardware protrusion into joint spaces following fracture fixation have been performed to address whether or not there is discrepancy between the actual and radiographic appearance of screw prominence. The purpose of our study was to prove that, with respect to the scaphoid, prominence as visualized on CT scan is real and not a result of metal artifact.

Methods: Forty-two cadaveric wrists were separated into four allotted groups with 21 control specimens and 21 study specimens.

Fibroma of the tendon sheath - a rare hand tumor.

Fibroma of the tendon sheath (FTS) is a rare, benign, soft tissue lesion. Clinically, FTS presents similarly to the more common giant cell tumor of the tendon sheath. It is distinguished histologically by the lack of giant cells, foamy histiocytes and synovial cells.

Cartesian positioning system for localization of blast and ballistic fragments: a phantom-based pilot study.

Our purpose was to demonstrate the consistency of radiologists' three-dimensional measurements of simulated blast fragment locations in vitro in an effort to objectively localize retained fragments and wound paths. We designed a phantom consisting of 10 nail heads (simulating blast fragments) glued to wooden pegs that were randomly situated at distances from a reference point within a plastic tub. The x, y, and z coordinates of simulated fragments were recorded in Cartesian 3-space relative to the reference point.

Blast and ballistic trajectories in combat casualties: a preliminary analysis using a cartesian positioning system with MDCT.

Objective: The purpose of this study is to determine the agreement with which radiologists identify wound paths in vivo on MDCT and calculate missile trajectories on the basis of Cartesian coordinates using a Cartesian positioning system (CPS).

Materials And Methods: Three radiologists retrospectively identified 25 trajectories on MDCT in 19 casualties who sustained penetrating trauma in Iraq. Trajectories were described qualitatively in terms of directional path descriptors and quantitatively as trajectory vectors.

CT-based ballistic wound path identification and trajectory analysis in anatomic ballistic phantoms.

Purpose: To evaluate the accuracy of computed tomography (CT)-based ballistic wound path identification in phantoms by determining the agreement between actual shooting angles and both trajectory angles measured with a picture archiving and communication system (PACS) angle tool and angles calculated from x, y, z coordinates of the entrance and exit points.

Materials And Methods: In this institutional review board-approved model study, two simulated legs were shot by a trained marksman from 50 yards at six clinometer-measured angles with a 0.30-06 rifle and then scanned at multidetector CT.

Effect of computer-aided detection for CT colonography in a multireader, multicase trial.

Purpose: To assess the effect of using computer-aided detection (CAD) in second-read mode on readers' accuracy in interpreting computed tomographic (CT) colonographic images.

Materials And Methods: The contributing institutions performed the examinations under approval of their local institutional review board, with waiver of informed consent, for this HIPAA-compliant study. A cohort of 100 colonoscopy-proved cases was used: In 52 patients with findings positive for polyps, 74 polyps of 6 mm or larger were observed in 65 colonic segments; in 48 patients with findings negative for polyps, no polyps were found.

Virtual colonoscopy in the US Army: current utilization at the Walter Reed Army Medical Center.

Virtual colonoscopy (VC), also known as CT colonography, continues to gain momentum worldwide as a safe and accurate alternative to traditional optical colonoscopy (OC) for colorectal cancer (CRC) screening. Within the US Army medical system, VC has experienced sustained growth since the program's inception in 2003. Integral to the success of this screening program has been dedicated radiologists and clinical support staff, collaboration with gastroenterology and an active training program for radiologists.