A new technique to characterize CT scanner bow-tie filter attenuation and applications in human cadaver dosimetry simulations.

Purpose: To present a noninvasive technique for directly measuring the CT bow-tie filter attenuation with a linear array x-ray detector.

Methods: A scintillator based x-ray detector of 384 pixels, 307 mm active length, and fast data acquisition (model X-Scan 0.8c4-307, Detection Technology, FI-91100 Ii, Finland) was used to simultaneously detect radiation levels across a scan field-of-view.

In vitro dose measurements in a human cadaver with abdomen/pelvis CT scans.

Purpose: To present a study of radiation dose measurements with a human cadaver scanned on a clinical CT scanner.

Methods: Multiple point dose measurements were obtained with high-accuracy Thimble ionization chambers placed inside the stomach, liver, paravertebral gutter, ascending colon, left kidney, and urinary bladder of a human cadaver (183 cm in height and 67.5 kg in weight) whose abdomen/pelvis region was scanned repeatedly with a multidetector row CT.