Objective image characterization of a spectral CT scanner with dual-layer detector.

Objective image characterization of a spectral CT scanner with dual-layer detector.
Phys Med Biol. 2017 Nov 29;:
Authors: Ozguner O, Dhanantwari A, Halliburton S, Wen G, Utrup S, Jordan DW
Abstract
This work evaluated the performance of a detector-based spectral CT system by
 obtaining objective reference data, evaluating attenuation response of iodine and accuracy of iodine quantification, and comparing conventional CT and virtual monoenergetic images in three common phantoms. Scanning was performed using the hospital's clinical adult body protocol. Modulation transfer function (MTF) was calculated for a tungsten wire and visual line pair targets were evaluated. Image noise power spectrum (NPS) and pixel standard deviation
 were calculated. MTF for monoenergetic images agreed with conventional images within 0.05 lp/cm. NPS curves indicated that noise texture of 70 keV monoenergetic images is similar to conventional images. Standard deviation measurements showed monoenergetic images have lower noise except at 40 keV. Mean CT number and CNR agreed with conventional images at
 75 keV. Measured iodine concentration agreed with true concentration within 6% for inserts at the center of the phantom. Performance of monoenergetic images at detector based spectral CT is the same as, or better than, that of conventional images. Spectral acquisition and reconstruction with a detector based platform represents the physica...

Source: Physics in Medicine and Biology - November 29, 2017 Category: Physics Authors: Ozguner O, Dhanantwari A, Halliburton S, Wen G, Utrup S, Jordan DW Tags: Phys Med Biol Source Type: research