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Low dose computed tomography

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https://www.readbyqxmd.com/read/28734394/low-dose-computed-tomography-for-lung-cancer-screening-the-protocol-and-the-dose
#1
Shaunagh McDermott, Mannudeep K Kalra
No abstract text is available yet for this article.
July 2017: Seminars in Roentgenology
https://www.readbyqxmd.com/read/28728713/lung-cancer-screening-and-its-impact-on-surgical-volume
#2
REVIEW
Andrew P Dhanasopon, Anthony W Kim
Lung cancer screening has demonstrated a reduction in lung cancer mortality by 20%. Annual low-dose computed tomography examination in high-risk individuals is now recommended by multiple national health care organizations and is covered under Medicare and Medicaid services. The impact of this public health intervention is projected to increase the case load for the thoracic surgery workforce.
August 2017: Surgical Clinics of North America
https://www.readbyqxmd.com/read/28728443/functional-assessment-of-coronary-artery-disease-by-cardiac-computed-tomography
#3
T A Treibel, A Rossi, F Pugliese, C Davies
Rapid technological advances in computed tomography (CT) have allowed CT coronary angiography (CTCA) to be delivered at low radiation dose and high diagnostic accuracy. Due to its high negative predictive value for coronary artery disease, it has become a gatekeeper for the assessment of patients with chest pain of recent onset. Second line functional assessment of a detected coronary stenosis relies mostly on other imaging modalities. Functional assessment of coronary artery disease by CT is therefore an attractive addition to CTCA...
July 21, 2017: Expert Review of Cardiovascular Therapy
https://www.readbyqxmd.com/read/28727865/proton-beam-radiotherapy-and-concurrent-chemotherapy-for-unresectable-stage-iii-non-small-cell-lung-cancer-final-results-of-a-phase-2-study
#4
Joe Y Chang, Vivek Verma, Ming Li, Wencheng Zhang, Ritsuko Komaki, Charles Lu, Pamela K Allen, Zhongxing Liao, James Welsh, Steven H Lin, Daniel Gomez, Melenda Jeter, Michael O'Reilly, Ronald X Zhu, Xiaodong Zhang, Heng Li, Radhe Mohan, John V Heymach, Ara A Vaporciyan, Stephen Hahn, James D Cox
Importance: Proton beam radiotherapy (PBT) has the potential to reduce toxic effects in the definitive management of locally advanced non-small-cell lung cancer (NSCLC), but long-term prospective data are lacking. Objective: To report the final (5-year) results of a prospective study evaluating concurrent chemotherapy and high-dose PBT to treat unresectable stage III NSCLC. Design, Setting, and Participants: In this open-label, single-group assignment study, with median follow-up of 27...
July 20, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28726684/low-dose-4d-cone-beam-ct-via-joint-spatiotemporal-regularization-of-tensor-framelet-and-nonlocal-total-variation
#5
Hao Han, Hao Gao, Lei Xing
Excessive radiation exposure is still a major concern in 4D cone-beam computed tomography (4D-CBCT) due to its prolonged scanning duration. Radiation dose can be effectively reduced by either under-sampling the x-ray projections or reducing the x-ray flux. However, 4D-CBCT reconstruction under such low-dose protocols is prone to image artifacts and noise. In this work, we propose a novel joint regularization-based iterative reconstruction method for low-dose 4D-CBCT. To tackle the under-sampling problem, we employ spatiotemporal tensor framelet (STF) regularization to take advantage of the spatiotemporal coherence of the patient anatomy in 4D images...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28726575/bioprinting-pattern-dependent-electrical-mechanical-behavior-of-cardiac-alginate-implants-characterization-and-ex-vivo-phase-contrast-microtomography-assessment
#6
Mohammad Izadifar, Paul Babyn, Michael E Kelly, Dean Chapman, Xiongbiao Chen
Three-dimensional (3D)-bioprinting techniques may be used to modulate electrical/mechanical properties and porosity of hydrogel constructs for fabrication of suitable cardiac implants. Notably, characterization of these properties after implantation remains a challenge, raising the need for the development of novel quantitative imaging techniques for monitoring hydrogel implant behavior in-situ. This study aims to (i) assess the influence of hydrogel bioprinting patterns on electrical/mechanical behavior of cardiac implants based on a 3D-printing technique and (ii) investigate the potential of synchrotron X-ray phase contrast computed tomography (PCI-CT) for estimating elastic modulus/impedance/porosity and microstructural features of 3D-printed cardiac implants in-situ via an ex-vivo study...
July 20, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28725938/declining-radiation-dose-of-coronary-computed-tomography-angiography-german-cardiac-ct-registry-experience-2009-2014
#7
Axel Schmermund, Mohamed Marwan, Jörg Hausleiter, Sebastian Barth, Oliver Bruder, Sebastian Kerber, Grigorius Korosoglou, Alexander Leber, Werner Moshage, Stephen Schröder, Steffen Schneider, Jochen Senges, Stephan Achenbach
BACKGROUND: Coronary computed tomography angiography (CTA) is increasingly used as a test to rule out coronary artery disease (CAD) in patients with a low to intermediate pre-test probability of the disease. We used the database of the German CT registry, collected between 2009 and 2014 in a broad patient population, to analyze contemporary radiation dose associated with coronary CTA in clinical practice. PATIENTS AND METHODS: The prospective observational registry included a total of 7061 patients ≥18 years, referred to 12 participating centers for a clinically indicated cardiac CT examination...
July 19, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28725430/acute-interstitial-nephritis-after-sequential-ipilumumab-nivolumab-therapy-of-metastatic-melanoma
#8
Lea Bottlaender, Anne-Laure Breton, Louis de Laforcade, Frederique Dijoud, Luc Thomas, Stephane Dalle
BACKGROUND: The anti-Programmed Death receptor 1 (anti-PD-1) antibodies nivolumab and pembrolizumab are new treatments in metastatic melanoma. Immunotherapies are best known to be responsible for thrombotic microangiopathy. However, immune interstitial nephritis has been described in a patient treated by nivolumab and ipilimumab concomitantly, and three cases of granulomatous interstitial nephritis have been reported with ipilimumab monotherapy. We report herein a case of acute interstitial immune nephritis in a patient treated with nivolumab after ipilimumab for pulmonary metastatic melanoma...
2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28724866/effect-of-reduced-tube-voltage-on-diagnostic-accuracy-of-ct-colonography
#9
Yoshihiro Futamata, Tomoaki Koide, Riku Ihara
The normal tube voltage in computed tomography colonography (CTC) is 120 kV. Some reports indicate that the use of a low tube voltage (lower than 120 kV) technique plays a significant role in reduction of radiation dose. However, to determine whether a lower tube voltage can reduce radiation dose without compromising diagnostic accuracy, an evaluation of images that are obtained while maintaining the volume CT dose index (CTDIvol) is required. This study investigated the effect of reduced tube voltage in CTC, without modifying radiation dose (i...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28719979/prevalence-of-protective-shielding-utilization-for-radiation-dose-reduction-in-adult-patients-undergoing-body-scanning-using-computed-tomography
#10
Shoaib Safiullah, Roshan M Patel, Brittany Uribe, Kyle Spradling, Chandana Lall, Lishi Zhang, Zhamshid Okhunov, Ralph Clayman, Jaime Landman
PURPOSE: Ionizing radiation is implicated in nearly 2% of malignancies in the United States; radiation shields prevent unnecessary radiation exposure during medical imaging. Contemporary radiation shield utilization for adult patients in the United States is poorly defined. Therefore, we evaluated the prevalence of protective shielding utilization in adult patients undergoing computed tomography scans in United States' hospitals. METHODS: An online survey was sent to established radiology departments randomly selected from the 2015 American Hospital Association Guide...
July 18, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28718888/assessing-lung-function-using-contrast-enhanced-dual-energy-computed-tomography-for-potential-applications-in-radiation-therapy
#11
Andréanne Lapointe, Houda Bahig, Danis Blais, Hugo Bouchard, Édith Filion, Jean-François Carrier, Stéphane Bedwani
PURPOSE: There is an increasing interest in the evaluation of lung function from physiological images in radiation therapy treatment planning to reduce the extent of post-radiation toxicities. The purpose of this work is to retrieve reliable functional information from contrast-enhanced dualenergy computed tomography (DECT) for new applications in radiation therapy. The functional information obtained by DECT is also compared with other methods using single energy CT (SECT) and single-photon emission computed tomography (SPECT) with CT...
July 18, 2017: Medical Physics
https://www.readbyqxmd.com/read/28716106/acute-interstitial-nephritis-after-sequential-ipilumumab-nivolumab-therapy-of-metastatic-melanoma
#12
Lea Bottlaender, Anne-Laure Breton, Louis de Laforcade, Frederique Dijoud, Luc Thomas, Stephane Dalle
BACKGROUND: The anti-Programmed Death receptor 1 (anti-PD-1) antibodies nivolumab and pembrolizumab are new treatments in metastatic melanoma. Immunotherapies are best known to be responsible for thrombotic microangiopathy. However, immune interstitial nephritis has been described in a patient treated by nivolumab and ipilimumab concomitantly, and three cases of granulomatous interstitial nephritis have been reported with ipilimumab monotherapy. We report herein a case of acute interstitial immune nephritis in a patient treated with nivolumab after ipilimumab for pulmonary metastatic melanoma...
July 18, 2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28715327/joint-statistical-iterative-material-image-reconstruction-for-spectral-computed-tomography-using-a-semi-empirical-forward-model
#13
Korbinian Mechlem, Sebastian Ehn, Thorsten Sellerer, Eva Braig, Daniela Munzel, Franz Pfeiffer, Peter B Noel
By acquiring tomographic measurements with several distinct photon energy spectra, spectral computed tomography (spectral CT) is able to provide additional material-specific information compared to conventional CT. This information enables the generation of material selective images, which have found various applications in medical imaging. However, material decomposition typically leads to noise amplification and a degradation of the signal-to-noise ratio. This is still a fundamental problem of spectral CT, especially for low-dose medical applications...
July 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28711185/dosimetric-characterization-of-3d-printed-bolus-at-different-infill-percentage-for-external-photon-beam-radiotherapy
#14
Rosalinda Ricotti, Delia Ciardo, Floriana Pansini, Alessia Bazani, Stefania Comi, Ruggero Spoto, Samuele Noris, Federica Cattani, Guido Baroni, Roberto Orecchia, Andrea Vavassori, Barbara Alicja Jereczek-Fossa
BACKGROUND AND PURPOSE: 3D printing is rapidly evolving and further assessment of materials and technique is required for clinical applications. We evaluated 3D printed boluses with acrylonitrile butadiene styrene (ABS) and polylactide (PLA) at different infill percentage. MATERIAL AND METHODS: A low-cost 3D printer was used. The influence of the air inclusion within the 3D printed boluses was assessed thoroughly both with treatment planning system (TPS) and with physical measurements...
July 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28709441/mortality-outcomes-of-low-dose-computed-tomography-screening-for-lung-cancer-in-urban-china-a-decision-analysis-and-implications-for-practice
#15
Zixing Wang, Wei Han, Weiwei Zhang, Fang Xue, Yuyan Wang, Yaoda Hu, Lei Wang, Chunwu Zhou, Yao Huang, Shijun Zhao, Wei Song, Xin Sui, Ruihong Shi, Jingmei Jiang
BACKGROUND: Mortality outcomes in trials of low-dose computed tomography (CT) screening for lung cancer are inconsistent. This study aimed to evaluate whether CT screening in urban areas of China could reduce lung cancer mortality and to investigate the factors that associate with the screening effect. METHODS: A decision tree model with three scenarios (low-dose CT screening, chest X-ray screening, and no screening) was developed to compare screening results in a simulated Chinese urban cohort (100,000 smokers aged 45-80 years)...
July 14, 2017: Chinese Journal of Cancer
https://www.readbyqxmd.com/read/28708724/impact-of-ssf-on-diagnostic-performance-of-coronary-computed-tomography-angiography-within-1-heart-beat-in-patients-with-high-heart-rate-using-a-256-row-detector-computed-tomography
#16
Junfu Liang, Hui Wang, Lei Xu, Li Dong, Zhanming Fan, Rui Wang, Zhonghua Sun
OBJECTIVE: The aim of this study was to investigate the impact of a motion-correction algorithm on diagnostic accuracy of coronary computed tomography angiography (CCTA) within 1 heart beat in patients with high heart rate (HR) using a 256-row detector CT. METHOD: Sixty-four consecutive patients with known or suspected coronary artery disease (symptomatic) and with HR of 75 beats per minute or greater (mean [SD] HR, 82.6 [7.3] beats per minute) undergoing CCTA and invasive coronary angiography within 4 weeks were prospectively enrolled...
July 13, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28705917/curative-multi-cycle-radioimmunotherapy-monitored-by-quantitative-spect-ct-based-theranostics-using-bispecific-antibody-pretargeting-strategy-in-colorectal-cancer
#17
Sarah M Cheal, Edward K Fung, Miteshkumar V Patel, Blesida Punzalan, Hong Xu, Hong-Fen Guo, Pat B Zanzonico, Sebastien Monette, Karl Dane Wittrup, Nai-Kong Cheung, Steven M Larson
Radioimmunotherapy of solid tumors using antibody-targeted radionuclides has been limited by low therapeutic indices (TI). We recently reported a novel three-step pretargeted radioimmunotherapy (PRIT) strategy based on a glycoprotein A33 (GPA33)-targeting bispecific antibody (bsAb) and a small-molecule radioactive hapten, a complex of lutetium-177 ((177)Lu) and S-2-(4-aminobenzyl)-1,4,7,10-tetraazacyclododecane tetraacetic acid ((177)Lu-DOTA-Bn) that leads to high TIs for radiosensitive tissues such as blood (TI = 73) and kidney (TI = 12)...
July 13, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28705206/digital-evaluation-of-nasal-changes-induced-by-rapid-maxillary-expansion-with-different-anchorage-and-appliance-design
#18
Rosamaria Fastuca, Paola Lorusso, Manuel O Lagravère, Ambra Michelotti, Marco Portelli, Piero Antonio Zecca, Vincenzo D' Antò, Angela Militi, Riccardo Nucera, Alberto Caprioglio
BACKGROUND: Scientific evidence showed that rapid maxillary expansion (RME) affects naso-maxillary complex, increasing nasal width and volume. This study aimed to evaluate nasal changes induced by rapid maxillary expansion with different anchorage and appliance design by using low dose and cone beam computed tomography. METHODS: A total of 44 patients (20 males, mean age 8y 8 m ± 1y 2 m; 24 females mean age 8y 2 m ± 1y 4 m) were included in the investigation and divided into three groups according to the appliance: Hyrax-type expander anchored to permanent teeth, modified Hyrax-type expander anchored to deciduous teeth, modified Haas-type expander anchored to deciduous teeth...
July 14, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28703119/dna-double-strand-break-dsb-induction-and-cell-survival-in-iodine-enhanced-computed-tomography-ct
#19
Seth W Streitmatter, Robert D Stewart, Peter A Jenkins, Tatjana Jevremovic
A multi-scale Monte Carlo model is proposed to assess the dosimetric and biological impact of iodine-based contrast agents commonly used in computed tomography. As presented, the model integrates the general purpose MCNP6 code system for larger-scale radiation transport and dose assessment with the Monte Carlo damage simulation to determine the sub-cellular characteristics and spatial distribution of initial DNA damage. The repair-misrepair-fixation model is then used to relate DNA double strand break (DSB) induction to reproductive cell death...
July 13, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28703104/high-pitch-dual-source-ct-angiography-without-ecg-gating-for-imaging-the-whole-aorta-intraindividual-comparison-with-standard-pitch-single-source-technique-without-ecg-gating
#20
Carmelinda Manna, Mario Silva, Rocco Cobelli, Sara Poggesi, Cristina Rossi, Nicola Sverzellati
PURPOSE: We aimed to perform intraindividual comparison of computed tomography (CT) parameters, image quality, and radiation exposure between standard CT angiography (CTA) and high-pitch dual source (DS)-CTA, in subjects undergoing serial CTA of thoracoabdominal aorta. METHODS: Eighteen subjects with thoracoabdominal CTA by standard technique and high-pitch DS-CTA technique within 6 months of each other were retrieved for intraindividual comparison of image quality in thoracic and abdominal aorta...
July 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
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