Objective image characterization of a spectral CT scanner with dual-layer detector
| Autor: | Amar Dhanantwari, Sandra Halliburton, Orhan Ozguner, Gezheng Wen, Steven J. Utrup, David W. Jordan |
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| Rok vydání: | 2018 |
| Předmět: |
Tomography Scanners
X-Ray Computed Materials science Radiological and Ultrasound Technology Phantoms Imaging business.industry Detector Image processing Signal-To-Noise Ratio Noise (electronics) Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics Signal-to-noise ratio 030220 oncology & carcinogenesis Optical transfer function Image Processing Computer-Assisted Image noise Humans Radiology Nuclear Medicine and imaging Tomography Tomography X-Ray Computed business Iodine |
| Zdroj: | Physics in Medicine & Biology. 63:025027 |
| ISSN: | 1361-6560 |
| DOI: | 10.1088/1361-6560/aa9e1b |
| Popis: | 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−1. 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 physical behaviour of iodine as expected and accurately quantifies the material concentration. |
| Databáze: | OpenAIRE |
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