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Low dose computed tomography

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https://www.readbyqxmd.com/read/27928239/comparison-of-tissue-density-in-hounsfield-units-in-computed-tomography-and-cone-beam-computed-tomography
#1
Masoud Varshowsaz, Sepideh Goorang, Sara Ehsani, Zeynab Azizi, Sepideh Rahimian
OBJECTIVES: Bone quality and quantity assessment is one of the most important steps in implant treatment planning. Different methods such as computed tomography (CT) and recently suggested cone beam computed tomography (CBCT) with lower radiation dose and less time and cost are used for bone density assessment. This in vitro study aimed to compare the tissue density values in Hounsfield units (HUs) in CBCT and CT scans of different tissue phantoms with two different thicknesses, two different image acquisition settings and in three locations in the phantoms...
March 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27927501/morphometric-analysis-of-the-thoracic-intervertebral-foramen-osseous-anatomy-in-adolescent-idiopathic-scoliosis-using-low-dose-computed-tomography
#2
Thorbjorn J Loch-Wilkinson, Maree T Izatt, Robert D Labrom, Geoffrey N Askin, Mark J Pearcy, Clayton J Adam
PURPOSE: The dimensions of the thoracic intervertebral foramen in adolescent idiopathic scoliosis (AIS) have not previously been quantified. Better understanding of the dimensions of the foramen may be useful in surgical planning. This study describes a reproducible method for measurement of the thoracic foramen in AIS using computed tomography (CT). METHODS: In 23 preoperative female patients with Lenke 1 type AIS with right-side convexity major curves confined to the thoracic spine the foraminal height (FH), foraminal width (FW), pedicle to superior articular process distance (P-SAP), and cross-sectional foraminal area (FA) were measured using multiplanar reconstructed CT...
May 2016: Spine Deformity
https://www.readbyqxmd.com/read/27923551/absorbed-dose-and-image-quality-of-varian-truebeam-cbct-compared-with-obi-cbct
#3
Daisuke Kawahara, Shuichi Ozawa, Takeo Nakashima, Tatsuhiko Suzuki, Masato Tsuneda, Sodai Tanaka, Yoshimi Ohno, Yuji Murakami, Yasushi Nagata
PURPOSE: Nowadays, patient positioning and target localization can be verified by using kilovolt cone beam computed tomography (kV-CBCT). There have been various studies on the absorbed doses and image qualities of different kV-CBCT systems. However, the Varian TrueBeam CBCT (TB CBCT) system has not been investigated so far. We assess the image quality and absorbed dose of TB CBCT through comparison with those of on-board imager (OBI) CBCT. METHODS: The image quality was evaluated using two phantoms...
December 3, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27909130/the-use-of-ultra-low-dose-ct-scans-for-the-evaluation-of-limb-fractures-is-the-reduced-effective-dose-using-ct-in-orthopaedic-injury-reduction-protocol-effective
#4
S R Konda, A M Goch, P Leucht, A Christiano, S Gyftopoulos, G Yoeli, K A Egol
AIMS: To evaluate whether an ultra-low-dose CT protocol can diagnose selected limb fractures as well as conventional CT (C-CT). PATIENTS AND METHODS: We prospectively studied 40 consecutive patients with a limb fracture in whom a CT scan was indicated. These were scanned using an ultra-low-dose CT Reduced Effective Dose Using Computed Tomography In Orthopaedic Injury (REDUCTION) protocol. Studies from 16 selected cases were compared with 16 C-CT scans matched for age, gender and type of fracture...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27908148/local-attenuation-curve-optimization-framework-for-high-quality-perfusion-maps-in-low-dose-cerebral-perfusion-ct
#5
Vincent Van Nieuwenhove, Geert Van Eyndhoven, K Joost Batenburg, Nico Buls, Jef Vandemeulebroucke, Jan De Beenhouwer, Jan Sijbers
PURPOSE: Cerebral perfusion x-ray computed tomography (PCT) is a powerful tool for noninvasive imaging of hemodynamic information throughout the brain. Conventional PCT requires the brain to be imaged multiple times during the perfusion process, and hence radiation dose is a major concern. The authors propose a PCT reconstruction algorithm that allows for lowering the dose while maintaining a high quality of the perfusion maps. It relies on an accurate estimation of the arterial input function (AIF), which in turn depends on the quality of the attenuation curves in the arterial region...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27907049/dual-energy-ct-pulmonary-angiography-with-6g-iodine-a-propensity-score-matched-study
#6
Andreas Meier, Kai Higashigaito, Katharina Martini, Moritz Wurnig, Burkhardt Seifert, Dagmar Keller, Thomas Frauenfelder, Hatem Alkadhi
OBJECTIVE: To evaluate the performance of low contrast media (CM) dose dual-energy computed tomography pulmonary angiography (CTPA) with advanced monoenergetic reconstructions in patients with suspected pulmonary embolism (PE). MATERIALS AND METHODS: The study had institutional review board approval; all patients gave written informed consent. Forty-one patients (25 men, 16 women, mean age 62.9±14.7 years) undergoing low CM dose (15ml, 6g iodine) dual-energy CTPA with advanced monoenergetic reconstructions were matched via propensity-scoring based on logistic regression analysis with a comparison group of 41 patients (24 men, 17 women, mean age 62...
2016: PloS One
https://www.readbyqxmd.com/read/27897029/a-method-for-evaluating-the-performance-of-computer-aided-detection-of-pulmonary-nodules-in-lung-cancer-ct-screening-detection-limit-for-nodule-size-and-density
#7
Hajime Kobayashi, Masaki Ohkubo, Akihiro Narita, Janaka C Marasinghe, Kohei Murao, Toru Matsumoto, Shusuke Sone, Shinichi Wada
OBJECTIVES: We propose the application of virtual nodules to evaluate the performance of computer-aided detection (CAD) of lung nodules in cancer screening using low-dose computed tomography (CT). METHODS: The virtual nodules were generated based on the spatial resolution measured for a CT system used in an institution providing cancer screening and were fused into clinical lung images obtained at that institution, allowing site-specificity. First, we validated the virtual nodules as an alternative to artificial nodules inserted into a phantom...
November 29, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27895964/half-fan-based-intensity-weighted-region-of-interest-imaging-for-low-dose-cone-beam-ct-in-image-guided-radiation-therapy
#8
Boyeol Yoo, Kihong Son, Rizza Pua, Jinsung Kim, Alexander Solodov, Seungryong Cho
OBJECTIVES: With the increased use of computed tomography (CT) in clinics, dose reduction is the most important feature people seek when considering new CT techniques or applications. We developed an intensity-weighted region-of-interest (IWROI) imaging method in an exact half-fan geometry to reduce the imaging radiation dose to patients in cone-beam CT (CBCT) for image-guided radiation therapy (IGRT). While dose reduction is highly desirable, preserving the high-quality images of the ROI is also important for target localization in IGRT...
October 2016: Healthcare Informatics Research
https://www.readbyqxmd.com/read/27895679/the-impact-of-body-mass-index-on-dosimetric-quality-in-low-dose-rate-prostate-brachytherapy
#9
Michelle I Echevarria, Arash O Naghavi, Puja S Venkat, Yazan A Abuodeh, Carlos Chevere, Kosj Yamoah
PURPOSE: Low-dose-rate (LDR) brachytherapy has been established as an effective and safe treatment option for men with low and intermediate risk prostate cancer. In this retrospective analysis, we sought to study the effect of body mass index (BMI) on post-implant dosimetric quality. MATERIAL AND METHODS: After institutional approval, records of patients with non-metastatic prostate cancer treated in Puerto Rico with LDR brachytherapy during 2008-2013 were reviewed...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27894310/monitoring-change-in-volume-of-calcifications-in-juvenile-idiopathic-inflammatory-myopathy-a-pilot-study-using-low-dose-computed-tomography
#10
Maria Ibarra, Cynthia Rigsby, Gabrielle A Morgan, Christina L Sammet, Chiang-Ching Huang, Dong Xu, Ira N Targoff, Lauren M Pachman
BACKGROUND: Dystrophic calcifications may occur in patients with J uvenile Idiopathic Inflammatory Myopathy (JIIM) as well as other connective tissue and metabolic diseases, but a reliable method of measuring the volume of these calcifications has not been established. The purpose of this study is to determine the feasibility of low dose, limited slice, Computed Tomography (CT) to measure objectively in-situ calcification volumes in patients with JIIM over time. METHODS: Ten JIIM patients (eight JDM, two Overlap) with calcifications were prospectively recruited over a 2-year period to undergo two limited, low dose, four-slice CT scans...
November 29, 2016: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/27893491/role-of-low-molecular-weight-heparins-in-prevention-of-thromboembolic-complication-after-transarterial-chemoembolization-in-hepatocellular-carcinoma
#11
Osama Negm, Sabry Abou Saif, Mohamed El Gharib, Mohamed Yousef, Sherief Abd-Elsalam
BACKGROUND AND AIM: Portal vein thrombosis (PVT) is a common complication after transarterial chemoembolization (TACE) in hepatocellular carcinoma (HCC). This is the first clinical study to evaluate the role of low-molecular-weight heparins (LMWHs) with TACE in HCC for the prevention of thromboembolism complications (PVT). PATIENTS AND METHODS: This study was carried out on 40 patients with HCC requiring TACE who presented to the Tropical Medicine Department, Tanta University and Interventional Radiology Department of Ain-Shams University Hospitals starting from April 2015...
November 23, 2016: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/27890524/the-dancavas-pilot-study-of-multifaceted-screening-for-subclinical-cardiovascular-disease-in-men-and-women-aged-65-74%C3%A2-years
#12
T V Kvist, J S Lindholt, L M Rasmussen, R Søgaard, J Lambrechtsen, F H Steffensen, L Frost, M H Olsen, H Mickley, J Hallas, G Urbonaviciene, M Busk, K Egstrup, A C P Diederichsen
OBJECTIVE/BACKGROUND: This pilot study of a large population based randomised screening trial investigated feasibility, acceptability, and relevance (prevalence of clinical and subclinical cardiovascular disease [CVD] and proportion receiving insufficient prevention) of a multifaceted screening for CVD. METHODS: In total, 2060 randomly selected Danish men and women aged 65-74 years were offered (i) low dose non-contrast computed tomography to detect coronary artery calcification (CAC) and aortic/iliac aneurysms; (ii) detection of atrial fibrillation (AF); (iii) brachial and ankle blood pressure measurements; and (iv) blood levels of cholesterol and hemoglobin A1c...
November 24, 2016: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/27889655/a-prediction-model-based-on-biomarkers-and-clinical-characteristics-for-detection-of-lung-cancer-in-pulmonary-nodules
#13
Jie Ma, Maria A Guarnera, Wenxian Zhou, HongBin Fang, Feng Jiang
Lung cancer early detection by low-dose computed tomography (LDCT) can reduce the mortality. However, LDCT increases the number of indeterminate pulmonary nodules (PNs), whereas 95% of the PNs are ultimately false positives. Modalities for specifically distinguishing between malignant and benign PNs are urgently needed. We previously identified a panel of peripheral blood mononucleated cell (PBMC)-miRNA (miRs-19b-3p and -29b-3p) biomarkers for lung cancer. This study aimed to evaluate efficacy of integrating biomarkers and clinical and radiological characteristics of smokers for differentiating malignant from benign PNs...
November 24, 2016: Translational Oncology
https://www.readbyqxmd.com/read/27885441/bayesian-comparative-assessment-of-diagnostic-accuracy-of-low-dose-ct-scan-and-ultrasonography-in-the-diagnosis-of-urolithiasis-after-the-application-of-the-stone-score
#14
Laila Cochon, Jeffrey Smith, Amado Alejandro Baez
OBJECTIVE: The objective of our study was to assess the diagnostic quality of low-dose computed tomography (CT) when compared to ultrasound (US) in diagnosis of urolithiasis using STONE score as a predictor of pre-test probability and the Bayesian statistical model to calculate post-test probabilities (POST) for both diagnostic tests. METHODS: STONE score was used to form risk groups to obtain pre-test probabilities. Likelihood ratios (LR) were calculated from external data for low-dose CT and US...
November 25, 2016: Emergency Radiology
https://www.readbyqxmd.com/read/27884388/shaped-bolus-protocol-reduces-contrast-medium-volume-in-abdominal-ct-while-maintaining-image-quality
#15
P Navin, A M Murray, K Nandikumar, R Waldron, B Tuohy, M Casey
AIM: To prospectively assess whether bolus shaping to exponentially decrease the contrast medium injection rate leads to alteration in image validity or renal function. MATERIALS AND METHODS: In this prospective study, patients alternatively received 100 ml contrast medium versus 75 ml via bolus shaping. Image quality was assessed via measurement of attenuation values in the aorta, liver, and spleen and also blinded subjective assessment of image sharpness, low contrast detectability, image noise, and overall quality...
November 21, 2016: Clinical Radiology
https://www.readbyqxmd.com/read/27884196/palliative-treatment-of-pelvic-bone-tumors-using-radioiodine-125-i-brachytherapy
#16
Chongren Wang, Zhengqi Chen, Wei Sun, Yisilamu Yasin, Chuanyin Zhang, Xiaojun Ma, Jian Chen, Jiakang Shen, Yingqi Hua, Zhengdong Cai
BACKGROUND: Complete resection of pelvic bone tumors, especially recurrent and metastatic ones, is often impossible to achieve using conventional surgery. This study aimed to assess the benefits and adverse effects of computed tomography (CT)-guided radioiodine ((125)I) brachytherapy for inoperable recurrent and metastatic bone tumors of the pelvis. METHODS: This was a retrospective study of 22 patients with confirmed pelvic bone tumors (10 females and 12 males; 15-84 years; 21 with primary pelvic tumor and one with pelvic metastasis)...
November 25, 2016: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27879528/low-tube-voltage-computed-tomography-during-hepatic-arterial-phase-the-effect-of-body-habitus-on-image-quality
#17
Yang Shin Park, Chang Hee Lee, Jongmee Lee, Jae Woong Choi, Kyeong Ah Kim, Cheol Min Park
PURPOSE: This study aimed to evaluate the impact of body habitus factors on image quality of low-tube voltage computed tomography (CT) during the hepatic arterial phase. MATERIALS AND METHODS: Ninety-seven patients (66 men, 31 women; age range, 26-78 years) who underwent clinically indicated liver dynamic CT examination were enrolled in the study. Analysis with 80-kVp CT and intermediate tube current (277-337 mA) was performed in the late hepatic arterial phase using a 320-detector row scanner with adaptive iterative dose reduction 3-dimensional reconstruction...
November 23, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27879526/diagnostic-computed-tomography-coregistration-with-in-111-dtpa-octreotide-single-photon-emission-tomography-low-dose-computed-tomography
#18
Sagi Tshori, Moshe Bocher, Bella Yuzefovich, Rina Rubinstein, David J Gross, Merav Fraenkel, Yodphat Krausz
OBJECTIVES: In-111-DTPA-octreotide (OctreoScan) is still pivotal for neuroendocrine tumor imaging, despite the introduction of Ga-68-octreotide tracers. Low-dose computed tomography (LDCT) assists in the localization of SPECT findings but often results in uncertain interpretation. This retrospective study evaluates the impact of coregistration of In-111-DTPA-octreotide SPECT/LDCT with diagnostic CT on interpretation. METHODS: Thirty-five consecutive studies, in which coregistration was performed because of uncertain interpretation, were evaluated...
November 23, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27867174/operator-dose-measurements-and-image-quality-assessment-in-computed-tomography-fluoroscopy-using-bismuth-sheet
#19
Keisuke Takiguchi, Atsushi Urikura, Tsukasa Yoshida, Kenichi Hirosawa, Takahiro Ito, Yoshihiro Nakaya
OBJECTIVE: The purpose of this study was to assess the dose reduction and the image quality using bismuth sheets during the computed tomography fluoroscopy (CTF). MATERIALS AND METHODS: The bismuth sheets of 1-mm thick were put on the upper mylar ring to reduce the frontal X-ray. The dose rates of an operator were measured using a torso phantom in the patient position during the CTF. The torso phantom was set on the gantry rotation center (center) and the lower position from the center (off-center)...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/27866066/terminate-lung-cancer-tlc-study-a-mixed-methods-population-approach-to-increase-lung-cancer-screening-awareness-and-low-dose-computed-tomography-in-eastern-kentucky
#20
Roberto Cardarelli, David Reese, Karen L Roper, Kathryn Cardarelli, Frances J Feltner, Jamie L Studts, Jennifer R Knight, Debra Armstrong, Anthony Weaver, Dana Shaffer
For low dose CT lung cancer screening to be effective in curbing disease mortality, efforts are needed to overcome barriers to awareness and facilitate uptake of the current evidence-based screening guidelines. A sequential mixed-methods approach was employed to design a screening campaign utilizing messages developed from community focus groups, followed by implementation of the outreach campaign intervention in two high-risk Kentucky regions. This study reports on rates of awareness and screening in intervention regions, as compared to a control region...
November 17, 2016: Cancer Epidemiology
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