![]() ![]() However, using a diagnostic CT system for surgery applications poses significant logistical challenges. Multi-detector CT (MDCT) and helical scan modes have significantly improved the longitudinal coverage ranges, allowing for large volume scans in a short time. Introduction Computed tomography (CT) has become an indispensable tool for medical diagnosis and treatment. Keywords: CT dosimetry, AIRO image quality, AIRO mobile CT scanner, AIROġ. However detectability of the low contrast objects is poorer in the AIRO due to the presence of ring artifacts in the location of the targets. Due to a higher dose in terms of mGy/mAs at both head and body FOV, the contrast to noise ratio is higher in the AIRO system than in the Siemens scanner. NNPS of the AIRO shows low frequency noise due to ring-like artifacts which may be caused by detector calibration or lack of artifact reducing image post-processing. The Standard kernel in the AIRO system was evaluated to have 3 lp/cm and 4 lp/cm for the body and head FOVs respectively. The Siemens scanner had up to 7 lp/cm for the head FOV and H40 kernel and up to 5 lp/cm at body FOV for the B40f kernel. Based on MTF analysis, both Soft and Standard filters of the AIRO system lost resolution quickly compared to the Sensation 64 slice CT. Under identical technique factors radiation dose (mGy/mAs) from the AIRO mobile CT system (AIRO) is higher than that from a 64 slice CT scanner. ![]() Radiation dose and image quality were compared to those from a multi-detector CT scanner (Siemens Sensation 64). Spatial resolution, low contrast resolution, Modulation Transfer Function (MTF), and Normalized Noise Power Spectrum (NNPS) were analyzed. Image quality was evaluated with a CATPHAN 500 phantom. Radiation dose was measured using a conventional 100 mm pencil ionization chamber and CT polymethylmetacrylate (PMMA) body and head phantoms. Radiation dose and image quality from a recently introduced mobile CT imaging system are presented. Received 24 October 2014 Revised 26 January 2015 Accepted 8 March 2015 Abstract. Health Care System, Suite Dallas, TX, USA of Radiology, University of Kentucky, Lexington, KY, USA Journal of X-Ray Science and Technology 23 (2015) 373–381 DOI 10.3233/XST-150496 IOS Pressĭosimetric characterization and image quality evaluation of the AIRO mobile CT scanner Victor J. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |