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https://www.readbyqxmd.com/read/28197873/ct-angiography-of-the-kidney-using-routine-ct-and-the-latest-gemstone-spectral-imaging-combination-of-different-noise-indexes-image-quality-and-radiation-dose
#1
Yongxia Zhao, Yanmin Wu, Ziwei Zuo, Shujie Cheng
OBJECTIVE: The objective of our study was to compare the image quality and radiation dose of computed tomography angiography (CTA) of the kidney in patients with different body mass indexes using routine CT and the latest Gemstone Spectral Imaging (GSI) combination of different noise indexes (NI) with the adaptive statistical iterative reconstruction 2.0 algorithm (ASiR 2.0). METHODS: A total of 120 patients who had undergone a CTA of the kidney were divided into four groups (A, B, C and D), with 30 patients in each group...
February 15, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28177655/iterative-image-reconstruction-improves-the-accuracy-of-automated-plaque-burden-assessment-in-coronary-ct-angiography-a-comparison-with-intravascular-ultrasound
#2
Stefan B Puchner, Maros Ferencik, Akiko Maehara, Paul Stolzmann, Shixin Ma, Synho Do, Hans-Ulrich Kauczor, Gary S Mintz, Udo Hoffmann, Christopher L Schlett
OBJECTIVE: The purpose of this study was to determine whether use of iterative image reconstruction algorithms improves the accuracy of coronary CT angiography (CCTA) compared with intravascular ultrasound (IVUS) in semiautomated plaque burden assessment. MATERIALS AND METHODS: CCTA and IVUS images of seven coronary arteries were acquired ex vivo. CT images were reconstructed with filtered back projection (FBP) and adaptive statistical (ASIR) and model-based (MBIR) iterative reconstruction algorithms...
February 8, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28149087/motor-cognitive-processing-speed-estimation-among-the-primary-schoolchildren-by-deriving-prediction-formula-a-cross-sectional-study
#3
Vencita Priyanka Aranha, Monika Moitra, Shikha Saxena, Kanimozhi Narkeesh, Narkeesh Arumugam, Asir John Samuel
OBJECTIVES: Motor cognitive processing speed (MCPS) is often reported in terms of reaction time. In spite of being a significant indicator of function, behavior, and performance, MCPS is rarely used in clinics and schools to identify kids with slowed motor cognitive processing. The reason behind this is the lack of availability of convenient formula to estimate MCPS. Thereby, the aim of this study is to estimate the MCPS in the primary schoolchildren. MATERIALS AND METHODS: Two hundred and four primary schoolchildren, aged 6-12 years, were recruited by the cluster sampling method for this cross-sectional study...
January 2017: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/28116512/head-ct-image-quality-improvement-with-asir-v-using-a-reduced-radiation-dose-protocol-for-children
#4
Hyun Gi Kim, Ho-Joon Lee, Seung-Koo Lee, Hyun Ji Kim, Myung-Joon Kim
OBJECTIVE: To investigate the quality of images reconstructed with adaptive statistical iterative reconstruction V (ASIR-V), using pediatric head CT protocols. METHODS: A phantom was scanned at decreasing 20% mA intervals using our standard pediatric head CT protocols. Each study was then reconstructed at 10% ASIR-V intervals. After the phantom study, we reduced mA by 10% in the protocol for <3-year-old patients and applied 30% ASIR-V and by 30% in the protocol for 3- to 15-year-old patients and applied 40% ASIR-V...
January 23, 2017: European Radiology
https://www.readbyqxmd.com/read/28099224/comparison-of-model-based-iterative-reconstruction-adaptive-statistical-iterative-reconstruction-and-filtered-back-projection-for-detecting-hepatic-metastases-on-submillisievert-low-dose-computed-tomography
#5
Jung Hee Son, Seung Ho Kim, Jung-Hee Yoon, Yedaun Lee, Yun-Jung Lim, Seon-Jeong Kim
OBJECTIVE: The aim of the study was to compare the diagnostic performance of model-based iterative reconstruction (MBIR), adaptive statistical iterative reconstruction (ASIR), and filtered back projection (FBP) on submillisievert low-dose computed tomography (LDCT) for detecting hepatic metastases. METHODS: Thirty-eight patients having hepatic metastases underwent abdomen CT. Computed tomography protocol consisted of routine standard-dose portal venous phase scan (120 kVp) and 90-second delayed low-dose scan (80 kVp)...
January 18, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28077736/atypical-presentation-of-majocchi-s-granuloma-in-an-immunocompetent-host
#6
Nisha V Parmar, G Johny Asir, Shivaprakash M Rudramurthy
No abstract text is available yet for this article.
January 11, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28059562/spatial-and-contrast-resolution-of-ultralow-dose-dentomaxillofacial-ct-imaging-using-iterative-reconstruction-technology
#7
Gerlig Widmann, Alexander Bischel, Andreas Stratis, Hilde Bosmans, Reinhilde Jacobs, Eva-Maria Gassner, Wolfgang Puelacher, Ruben Pauwels
OBJECTIVE: The objective of this study was to determine how iterative reconstruction technology (IRT) influences contrast and spatial resolution in ultralow dose dentomaxillofacial computed tomography (CT) imaging. METHODS: A polymethyl methacrylate phantom with various inserts was scanned using a reference protocol at CTDIvol 36.56 mGy, a sinus protocol at 18.28 mGy, and ultralow dose protocols at 4.17, 2.36, 0.99, and 0.53 mGy. All datasets were reconstructed using filtered back projection (FBP) and the following IRTs: adaptive statistical iterative reconstructions (ASIR-50, ASIR-100), and model-based iterative reconstruction (MBIR)...
January 6, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28055250/assessment-of-chest-ct-at-ctdivol-less-than-1-mgy-with-iterative-reconstruction-techniques
#8
Atul Padole, Subba Digumarthy, Efren Flores, Rachna Madan, Shelly Mishra, Amita Sharma, Mannudeep K Kalra
OBJECTIVES: To assess the image quality of chest CT reconstructed with image-based (SafeCT), adaptive statistical (ASIR), and model based (MBIR) iterative reconstruction techniques (IRTs) at CTDIvol less than 1 mGy. METHODS: In an IRB approved study, 25 patients gave written informed consent for acquisition of three Reduced Dose (RD) (0.25, 0.4, 0.8 mGy) chest CT after standard of care CT (8 mGy) on a 64-channel multi-detector CT (MDCT) and reconstructed with SafeCT, ASIR, and MBIR...
January 5, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28053841/epidemiology-and-inequality-in-the-incidence-and%C3%A2-mortality-of-nasopharynx-cancer-in-asia
#9
Neda Mahdavifar, Mahshid Ghoncheh, Abdollah Mohammadian-Hafshejani, Bahman Khosravi, Hamid Salehiniya
OBJECTIVES: One of the most common head and neck cancers is nasopharynx cancer. Knowledge about the incidence and mortality of this disease and its distribution in terms of geographical areas is necessary for further study and better planning. Therefore, this study was conducted with the aim of determining the incidence and mortality rates of nasopharynx cancer and its relationship with the Human Development Index (HDI) in Asia in 2012. METHODS: The aim of this ecologic study was to assess the correlation between age-specific incidence rate (ASIR) and age-specific mortality rate (ASMR) with HDI and its components, which include the following: life expectancy at birth, mean years of schooling, and gross national income per capita...
December 2016: Osong Public Health and Research Perspectives
https://www.readbyqxmd.com/read/28048440/su-g-iep2-12-the-effect-of-iterative-reconstruction-and-ct-tube-voltage-on-hounsfield-unit-values-of-iodinated-contrast
#10
K Ogden, K Greene-Donnelly, D Vallabhaneni, E Scalzetti
PURPOSE: To investigate the effects of changing iterative reconstruction strength and tube voltage on Hounsfield Unit (HU) values of varying concentrations of Iodinated contrast medium in a phantom. METHOD: Iodinated contrast (Omnipaque 300, GE Healthcare, Princeton NJ) was diluted with distilled water to concentrations of 0.6, 0.9, 1.8, 3.6, 7.2, and 10.8 mg/mL of Iodine. The solutions were scanned in a patient equivalent water phantom on two MDCT scanners: VCT 64 slice (GE Medical Systems, Waukesha, WI) and an Aquilion One 320 slice scanner (Toshiba America Medical Systems, Tustin CA)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048267/su-f-i-30-minimization-of-resolution-loss-for-ct-scans-of-the-elbow-at-lateral-position
#11
Y Zhou, A Scott
PURPOSE: Resolution is vital in elbow CT in order to examine the details of fractures. However, it is significantly compromised when the elbow is at the lateral position due to the body attenuation and off-center position. We attempted to find the parameters to minimize the resolution loss while keeping the dose ALARA. METHODS: To simulate the medium and large patient respectively, an abdomen phantom (CIRS TE07) was used and then a fat-ring was added. A small tissue-equivalent phantom (CIRS TE02) simulating the elbow was connected to another smaller phantom (CIRS TE01)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047859/th-ab-207a-10-sub-msv-cerebral-ct-perfusion-imaging-using-prior-image-constrained-compressed-sensing-a-prospective-clinical-trial
#12
K Li, P Yang, M Cathey, J Tang, H Rowley, P Turski, V Prabhakaran, C Strother, G-H Chen
PURPOSE: A prospective clinical study was conducted to assess whether sub-mSv cerebral CT perfusion (CTP) imaging can be achieved using the Prior Image Constrained Compressed Sensing (PICSS) reconstruction algorithm. METHODS: Following a standard dose (SD) CTP acquisition, 31 patients (median age, 62 years; 15 M/16 F; median BMI, 27) underwent an additional reduced dose (RD) CTP acquisition at 20% of the standard dose level. Several algorithms (PICCS, ASIR, and FBP) were used to reconstruct CTP source images of the RD series...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047530/su-f-p-45-clinical-experience-with-radiation-dose-reduction-of-ct-examinations-using-iterative-reconstruction-algorithms
#13
V Weir, J Zhang
PURPOSE: Iterative reconstruction (IR) algorithms have been adopted by medical centers in the past several years. IR has a potential to substantially reduce patient dose while maintaining or improving image quality. This study characterizes dose reductions in clinical settings for CT examinations using IR. METHODS: We retrospectively analyzed dose information from patients who underwent abdomen/pelvis CT examinations with and without contrast media in multiple locations of our Healthcare system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042551/incidence-and-mortality-of-kidney-cancers-and-human-development-index-in-asia-a-matter-of-concern
#14
Masoumeh Arabsalmani, Abdollah Mohammadian-Hafshejani, Mahshid Ghoncheh, Fatemeh Hadadian, Farhad Towhidi, Kamran Vafaee, Hamid Salehiniya
BACKGROUND: The incidence and mortality of kidney cancer have steadily increased by 2%- 3% per decade worldwide, and an increased risk of kidney cancer has been observed in many Asian countries. The information on the incidence and mortality of a disease and its distribution is essential for better planning for prevention and further studies. OBJECTIVES: This study aimed to assess the incidence and mortality of kidney cancer and their correlation with the human development index (HDI) in Asia...
January 2017: Journal of Nephropathology
https://www.readbyqxmd.com/read/27833411/the-impact-of-iterative-reconstruction-in-low-dose-computed-tomography-on-the-evaluation-of-diffuse-interstitial-lung-disease
#15
Hyun-Ju Lim, Myung Jin Chung, Kyung Eun Shin, Hye Sun Hwang, Kyung Soo Lee
OBJECTIVE: To evaluate the impact of iterative reconstruction (IR) on the assessment of diffuse interstitial lung disease (DILD) using CT. MATERIALS AND METHODS: An American College of Radiology (ACR) phantom (module 4 to assess spatial resolution) was scanned with 10-100 effective mAs at 120 kVp. The images were reconstructed using filtered back projection (FBP), adaptive statistical iterative reconstruction (ASIR), with blending ratios of 0%, 30%, 70% and 100%, and model-based iterative reconstruction (MBIR), and their spatial resolution was objectively assessed by the line pair structure method...
November 2016: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/27824668/computed-tomography-guided-tumor-ablation-analysis-and-optimization-of-computed-tomography-technique-with-various-ablation-devices
#16
Adam E M Eltorai, Grayson L Baird, Nicholas Monu, Darren Bialo, Scott Collins, Jeom Soon Kim, Damian E Dupuy
PURPOSE: Ablation device-associated computed tomography beam hardening artifacts can make tumor margin visualization and its relationship to the ablation applicator tip challenging. Determine optimal scanning conditions for currently-used applicators. MATERIALS AND METHODS: Eleven applicators were placed in ex vivo cow livers with implanted mock tumors, surrounded by bolus gel. Various computed tomography scans were performed at 440 mA with 5 mm thickness changing kVp (80, 100, 120, 140), scan time (0...
November 7, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27802249/ct-pulmonary-angiography-using-different-noise-index-values-with-an-iterative-reconstruction-algorithm-and-dual-energy-ct-imaging-using-different-body-mass-indices-image-quality-and-radiation-dose
#17
Yongxia Zhao, Yanmin Wu, Ziwei Zuo, Hongna Suo, Sisi Zhao, Haisong Zhang
OBJECTIVE: To investigate the differences in imaging quality and radiation dose in CT pulmonary angiography (CTPA) by using fast-kV switching dual energy CT imaging and 3D Smart mA modulation at different body mass indices (BMIs) and at different noise index (NI) values with an adaptive statistical iterative reconstruction (ASIR) algorithm. METHODS: Four hundred patients who underwent CTPA were equally divided into two groups: A (18.5 kg/m2 ≦ BMI <24.9 kg/m2) and B (24...
October 6, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27786546/ct-of-facial-fracture-fixation-an-experimental-study-of-artefact-reducing-methods
#18
Elina M Peltola, Teemu Mäkelä, Ville Haapamäki, Anni Suomalainen, Junnu Leikola, Seppo K Koskinen, Mika Kortesniemi, Mika P Koivikko
OBJECTIVES: This study aimed to determine the optimal post-operative CT imaging method that enables best visualization of facial bony structures in the vicinity of osteosynthesis material. METHODS: Conducted at Töölö Hospital (Helsinki, Finland), this study relied on scanning a phantom with CBCT, 64-slice CT and high-definition multislice CT with dual-energy scan (providing monochromatic images of 70-, 100-, 120- and 140-keV energy levels) and iterative reconstruction (IR) methods...
February 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27770319/efficacy-of-model-based-iterative-reconstruction-technique-in-non-enhanced-ct-of-the-renal-tracts-for-ureteric-calculi
#19
T J Tan, Kenneth K Lau, Dana Jackson, Nicholas Ardley, Adina Borasu
The purpose of this study was to assess the efficacy of model-based iterative reconstruction (MBIR), statistical iterative reconstruction (SIR), and filtered back projection (FBP) image reconstruction algorithms in the delineation of ureters and overall image quality on non-enhanced computed tomography of the renal tracts (NECT-KUB). This was a prospective study of 40 adult patients who underwent NECT-KUB for investigation of ureteric colic. Images were reconstructed using FBP, SIR, and MBIR techniques and individually and randomly assessed by two blinded radiologists...
October 21, 2016: Emergency Radiology
https://www.readbyqxmd.com/read/27769663/influence-of-adaptive-statistical-iterative-reconstruction-on-coronary-plaque-analysis-in-coronary-computed-tomography-angiography
#20
Helle Precht, Pieter H Kitslaar, Alexander Broersen, Jouke Dijkstra, Oke Gerke, Jesper Thygesen, Kenneth Egstrup, Jess Lambrechtsen
PURPOSE: The purpose of this study was to study the effect of iterative reconstruction (IR) software on quantitative plaque measurements in coronary computed tomography angiography (CCTA). METHODS: Thirty patients with a three clinical risk factors for coronary artery disease (CAD) had one CCTA performed. Images were reconstructed using FBP, 30% and 60% adaptive statistical IR (ASIR). Coronary plaque analysis was performed as per patient and per vessel (LM, LAD, CX and RCA) measurements...
November 2016: Journal of Cardiovascular Computed Tomography
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