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https://www.readbyqxmd.com/read/28047535/su-f-i-38-patient-organ-specific-dose-assessment-in-coronary-ct-angiograph-using-voxellaized-volume-dose-index-in-monte-carlo-simulation
#1
Mohammadi Gh Fallal, Alam N Riyahi, Gh Graily, R Paydar
PURPOSE: Clinical use of multi detector computed tomography(MDCT) in diagnosis of diseases due to high speed in data acquisition and high spatial resolution is significantly increased. Regarding to the high radiation dose in CT and necessity of patient specific radiation risk assessment, the adoption of new method in the calculation of organ dose is completely required and necessary. In this study by introducing a conversion factor, patient organ dose in thorax region based on CT image data using MC system was calculated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047456/mo-de-207a-06-ecg-gated-ct-reconstruction-for-a-c-arm-inverse-geometry-x-ray-system
#2
J M Slagowski, Dap Dunkerley
PURPOSE: To obtain ECG-gated CT images from truncated projection data acquired with a C-arm based inverse geometry fluoroscopy system, for the purpose of cardiac chamber mapping in interventional procedures. METHODS: Scanning-beam digital x-ray (SBDX) is an inverse geometry fluoroscopy system with a scanned multisource x-ray tube and a photon-counting detector mounted to a C-arm. In the proposed method, SBDX short-scan rotational acquisition is performed followed by inverse geometry CT (IGCT) reconstruction and segmentation of contrast-enhanced objects...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046513/tu-h-207a-06-the-effects-of-various-ct-tube-current-modulation-tcm-schemes-on-dose-do-you-really-know-what-your-tcm-scheme-is-doing
#3
K Singhrao, M Bostani, A Hardy, C Cagnon, M McNitt-Gray
PURPOSE: To compare the effects of various tube current modulation (TCM) schemes - including attenuation-based, "organ-based" and combined schemes - on both the resulting tube current values as well as dose savings. METHODS: An anthropomorphic adult thorax phantom was scanned using a Multidetector row CT scanner that offered both attenuation-based and "organ-based" TCM schemes that could be used separately or in combination (Definition AS64, Siemens Healthcare)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28027768/the-evolution-of-radiation-dose-over-time-measurement-of-a-patient-cohort-undergoing-whole-body-examinations-on-three-computer-tomography-generations
#4
Roy P Marcus, Elise Koerner, Roland C Aydin, Dominik Zinsser, Tobias Finke, Christian J Cyron, Fabian Bamberg, Konstantin Nikolaou, Mike Notohamiprodjo
OBJECTIVES: To evaluate and compare the radiation dose and image quality of whole-body-CT (WBCT) performed on the 3rd-generation dual-source-CT (DSCT) with 2nd-generation DSCT and 64-slices-Single-Source-CT (SSCT) in a large patient cohort. MATERIAL AND METHODS: Using a monitoring and tracking software 1451, 747 and 1861 patients scanned with a one-spiral-thorax-abdomen-pelvis-CT-examination on a 3rd-, 2nd-generation DSCT and SSCT, respectively, were extracted from the PACS server...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28018936/noise-performance-of-low-dose-ct-comparison-between-an-energy-integrating-detector-and-a-photon-counting-detector-using-a-whole-body-research-photon-counting-ct-scanner
#5
Zhicong Yu, Shuai Leng, Steffen Kappler, Katharina Hahn, Zhoubo Li, Ahmed F Halaweish, Andre Henning, Cynthia H McCollough
Photon counting detector (PCD)-based computed tomography (CT) is an emerging imaging technique. Compared to conventional energy integrating detector (EID)-based CT, PCD-CT is able to exclude electronic noise that may severely impair image quality at low photon counts. This work focused on comparing the noise performance at low doses between the PCD and EID subsystems of a whole-body research PCD-CT scanner, both qualitatively and quantitatively. An anthropomorphic thorax phantom was scanned, and images of the shoulder portion were reconstructed...
October 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/27992931/extrapelvic-endometriosis
#6
Anne C Davis, Jeffrey M Goldberg
Extrapelvic endometriosis is a rare and complex phenomenon. The pathologic mechanism of intrapelvic endometriosis is generally accepted as being largely due to retrograde menstruation through the fallopian tubes; however, the mechanism by which extrapelvic endometriosis forms has proven to be much more elusive. This article reviews the pathophysiology, clinical signs and symptoms, diagnostic techniques, and treatment recommendations for extrapelvic endometriosis of the umbilicus, abdominal wall, thorax, and vulva...
December 19, 2016: Seminars in Reproductive Medicine
https://www.readbyqxmd.com/read/27986935/bioassay-and-scanning-electron-microscopic-observations-reveal-high-virulence-of-entomopathogenic-fungus-beauveria-bassiana-on-the-onion-maggot-diptera-anthomyiidae-adults
#7
Hui Zhang, Shengyong Wu, Zhenlong Xing, Xiaoqing Wang, Zhongren Lei
When flies were dipped in 1 × 10(8) conidia/ml conidia suspensions and then kept in the incubator (22 ± 1 °C, 70 ± 5% RH), scanning electron microscope observations revealed that, at 2 h, the majority of adhering Beauveria bassiana conidia were attached to either the wing surface or the interstitial area between the macrochaetae on the thorax and abdomen of the onion maggot adults. Germ tubes were being produced and had oriented toward the cuticle by 18 h. Penetration of the insect cuticle had occurred by 36 h, and by 48 h, germ tubes had completely penetrated the cuticle...
December 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/27914781/incident-air-kerma-to-absorbed-organ-dose-conversion-factors-for-breast-and-lung-in-pa-thorax-radiography-the-effect-of-patient-thickness-and-radiation-quality
#8
A Kelaranta, P Toroi, P Vock
PURPOSE: Converting the measurable quantities to patient organ doses in projection radiography is usually based on a standard-sized patient model and a specific radiation quality, which are likely to differ from the real situation. Large inaccuracies can therefore be obtained in organ doses, because organ doses are dependent on the exposure parameters, exposure geometry and patient anatomy. In this study, the effect of radiation quality and patient thickness on the organ dose conversion factors were determined...
December 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27843762/dangers-of-flying-high-and-diving-low-an-unusual-case-of-dyspnea
#9
Poornima Ramadas, Rumon Chakravarty, Prathik Krishnan, Anupa Nadkarni
Giant bullae are bullae that occupy at least 30 percent of a hemi thorax. This condition can rarely be idiopathic and not usually suspected in young patients with no risk factors. We describe a case of a giant solitary pulmonary bulla in a healthy young female with no known risk factors. 23-year-old female presented to the Emergency department with dyspnea and pleuritic right sided chest pain. She started experiencing these symptoms when she was on a 7-h flight and later experienced similar symptoms when she went scuba diving...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/27832558/a-comparative-study-of-tracheal-diameter-in-caucasian-and-chinese-patients
#10
A Tai, C Corke, G M Joynt, J Griffith, D Lunn, Pwy Tong
Ethnicity may be considered a factor when considering what size endotracheal tube to insert. In particular it has been suggested that Chinese patients have a smaller tracheal diameter, justifying the selection of smaller endotracheal tubes. We systematically evaluated transverse tracheal diameters in Chinese and Caucasian patients, utilising archived computer tomography images. A convenience sample of 100 Caucasian patients from Australia was compared with 100 Chinese patients from Hong Kong. Patients over 18 years of age who had undergone a computerised tomography scan of the neck and thorax, and also had accurate body height and weight recorded, were studied...
November 2016: Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/27690714/can-ems-providers-provide-appropriate-tidal-volumes-in-a-simulated-adult-sized-patient-with-a-pediatric-sized-bag-valve-mask
#11
Jeffrey Siegler, Melissa Kroll, Susan Wojcik, Hawnwan Philip Moy
INTRODUCTION: In the prehospital setting, Emergency Medical Services (EMS) professionals rely on providing positive pressure ventilation with a bag-valve-mask (BVM). Multiple emergency medicine and critical care studies have shown that lung-protective ventilation protocols reduce morbidity and mortality. Our primary objective was to determine if a group of EMS professionals could provide ventilations with a smaller BVM that would be sufficient to ventilate patients. Secondary objectives included 1) if the pediatric bag provided volumes similar to lung-protective ventilation in the hospital setting and 2) compare volumes provided to the patient depending on the type of airway (mask, King tube, and intubation)...
October 3, 2016: Prehospital Emergency Care
https://www.readbyqxmd.com/read/27575451/an-unusual-chest-x-ray-showing-part-of-a-drain-tube-still-in-the-thorax-after-its-removal-and-some-suggestive-ultrasound-findings
#12
Daniele G Biasucci, Alessandro Pizza, Andrea Scapigliati, Francesca Bevilacqua, Bruno ROMANò, Maria E Antoniucci, Michele Corrado, Sergio Guarneri, Roberto Zamparelli
No abstract text is available yet for this article.
August 30, 2016: Minerva Anestesiologica
https://www.readbyqxmd.com/read/27511340/an-experimental-comparative-study-on-classic-tube-thoracostomy-and-thoracostomy-with-a-newly-designed-thorax-drainage-catheter
#13
Mahmut Tokur, Mehmet Ergin, Mehmet Okumuş, Zerrin Defne Dündar
BACKGROUND/AIM: The collection of fluids, blood, pus, or air in the pleural cavity is a pathological condition requiring pleural drainage. A newly designed thorax drainage catheter in the prototype phase was used in this experimental study to test its efficacy. MATERIALS AND METHODS: A hemopneumothorax was first caused by a penetrating injury on the frontal axis of the sixth intercostal space on the right hemithorax with a scalpel on 6 female Sus domesticus swine subjects...
2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/27473367/evaluation-of-gantry-speed-on-image-quality-and-imaging-dose-for-4d-cone-beam-ct-acquisition
#14
Andrew P Santoso, Kwang H Song, Yujiao Qin, Stephen J Gardner, Chang Liu, Indrin J Chetty, Benjamin Movsas, Munther Ajlouni, Ning Wen
BACKGROUND: This study investigates the effect of gantry speed on 4DCBCT image quality and dose for the Varian On-Board Imager®. METHODS: A thoracic 4DCBCT protocol was designed using a 125 kVp spectrum. Image quality parameters were evaluated for 4DCBCT acquisition using Catphan® phantom with real-time position management™ system for gantry speeds varying between 1.0 to 6.0°/s. Superior-inferior motion of the phantom was executed using a sinusoidal waveform with five second period...
July 29, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27448342/fast-variance-prediction-for-iteratively-reconstructed-ct-images-with-locally-quadratic-regularization
#15
Stephen M Schmitt, Mitchell M Goodsitt, Jeffrey A Fessler
Predicting noise properties of iteratively reconstructed CT images is useful for analyzing reconstruction methods; for example, local noise power spectrum (NPS) predictions may be used to quantify the detectability of an image feature, to design regularization methods, or to determine dynamic tube current adjustment during a CT scan. This paper presents a method for fast prediction of reconstructed image variance and local NPS for statistical reconstruction methods using quadratic or locally quadratic regularization...
January 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27419065/spontaneous-bacterial-empyema-in-a-non-cirrhotic-end-stage-renal-disease-patient-with-immunosuppression
#16
Dennis Lourdusamy, Lubna B Munshi, Sherif Ali Eltawansy
Spontaneous Bacterial Empyema (SBEM) denotes infection of the pleural fluid in the absence of pneumonia. Almost all cases of SBEM in literature are described in a background of ascites secondary to cirrhosis. Contiguous spread of the infected ascitic fluid through defects in the diaphragm is the most likely mechanism of SBEM. Most of these cases are transudative in nature and are managed with antibiotics. Literature on SBEM in the absence of cirrhosis or ascites is very limited so far. We describe a 59 year old female with ESRD status post renal transplant, on chronic immunosuppression for renal allograft rejection who was admitted with pleuritic chest pain that turned to be secondary to right sided pleural effusion...
2016: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/27185991/clinical-profile-etiology-and-management-of-hydropneumothorax-an-indian-experience
#17
Vasunethra Kasargod, Nilkanth Tukaram Awad
INTRODUCTION: Hydropneumothorax is an abnormal presence of air and fluid in the pleural space. Even though the knowledge of hydro-pneumothorax dates back to the days of ancient Greece, not many national or international literatures are documented. AIM: To study clinical presentation, etiological diagnosis, and management of the patients of hydropneumothorax. MATERIALS AND METHODS: Patients admitted in a tertiary care hospital with diagnosis of hydropneumothorax between 2012 and 2014 were prospectively studied...
May 2016: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/27147323/development-of-a-method-to-estimate-organ-doses-for-pediatric-ct-examinations
#18
Antonios E Papadakis, Kostas Perisinakis, John Damilakis
PURPOSE: To develop a method for estimating doses to primarily exposed organs in pediatric CT by taking into account patient size and automatic tube current modulation (ATCM). METHODS: A Monte Carlo CT dosimetry software package, which creates patient-specific voxelized phantoms, accurately simulates CT exposures, and generates dose images depicting the energy imparted on the exposed volume, was used. Routine head, thorax, and abdomen/pelvis CT examinations in 92 pediatric patients, ranging from 1-month to 14-yr-old (49 boys and 43 girls), were simulated on a 64-slice CT scanner...
May 2016: Medical Physics
https://www.readbyqxmd.com/read/27075785/a-massive-haemothorax-as-an-unusual-complication-of-infective-endocarditis-caused-by-streptococcus-sanguinis
#19
Kyoung Jin Kim, Kang Won Lee, Ju Hee Choi, Jang Wook Sohn, Min Ja Kim, Young Kyung Yoon
OBJECTIVE AND IMPORTANCE: Infective endocarditis involving the tricuspid valve is an uncommon condition, and a consequent haemothorax associated with pulmonary embolism is extremely rare. Particularly, there are no guidelines for the management of this complication. We describe a rare case of pulmonary embolism and infarction followed by a haemothorax due to infective endocarditis of the tricuspid valve caused by Streptococcus sanguinis. CLINICAL PRESENTATION: A 25-year-old man with a ventricular septal defect (VSD) presented with fever...
August 2016: Acta Clinica Belgica
https://www.readbyqxmd.com/read/27069268/primary-spontaneous-pneumothorax-presenting-to-a-chiropractic-clinic-as-undifferentiated-thoracic-spine-pain-a-case-report
#20
Ryan Larson
OBJECTIVE: To present a case of primary spontaneous pneumothorax presenting to a chiropractic clinic as undifferentiated thoracic spine pain. CLINICAL FEATURES: A tall thin 25-year-old male anxiously presented to a chiropractic clinic with six days of sudden unexplained left thorax pain. His breathing was laboured and his dry cough aggravating. After assessment a high clinical suspicion of primary spontaneous pneumothorax prevailed. INTERVENTION AND OUTCOME: The patient was referred to hospital for further investigation and primary spontaneous pneumothorax was confirmed on chest radiograph...
March 2016: Journal of the Canadian Chiropractic Association
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