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https://www.readbyqxmd.com/read/28094413/electrical-impedance-tomography-for-lung-ventilation-monitoring-of-the-dog
#1
Simon Gloning, Korbinian Pieper, Martin Zoellner, Andrea Meyer-Lindenberg
BACKGROUND: Electrical impedance tomography (EIT) is a radiation free technique which takes advantage of the different electrical conductivities of different tissues. Its main field of application is lung ventilation monitoring. The aim of this prospective study was to evaluate the feasibility of collecting EIT information on a sample of dogs with different thoracic shapes under clinical conditions by connecting an electrode belt without fur clipping. MATERIAL AND METHODS: Fifteen pulmonary healthy dogs were anaesthetized, positioned in sternal recumbency and ventilated in a pressure-controlled mode at three different positive end-expiratory pressure levels (PEEP) of 0, 5 and 10 cmH2O for five breaths each, with a peak inspiratory pressure of 15 cmH2O...
January 17, 2017: Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere
https://www.readbyqxmd.com/read/28079960/successful-medical-management-of-a-domestic-longhair-cat-with-subdural-intracranial-empyema-and-multifocal-pneumonia
#2
Thomas J A Cardy, Richard Lam, Laureen M Peters, Philippa J McLaren, Màrian Matas Riera, Steven De Decker
OBJECTIVE: To describe a case of successful medical management of subdural intracranial empyema and multifocal pneumonia in a domestic longhaired cat. CASE SUMMARY: A 7-year-and-8-month-old male neutered domestic longhair cat presented with tachypnea, respiratory compromise, vestibular ataxia, obtundation, left-sided head tilt, and multiple cranial nerve deficits. Neuroanatomical localization was multifocal with central vestibular involvement. Magnetic resonance imaging of the head indicated diffuse subdural empyema, mainly affecting the middle cranial fossa and the right cerebrum...
January 12, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28073871/benign-cystic-mediastinal-teratoma-presenting-as-a-massive-pleural-effusion-in-a-17-year-old-boy
#3
Annalisa Montebello, Adrian Mizzi, Paul John Cassar, Karen Cassar
Mediastinal teratomas are a rare, albeit an important differential diagnosis of anterior/middle mediastinal masses in young adults and various atypical presentations have been reported. The authors report a case of a 17-year-old boy who presented with a 2-month history of worsening shortness of breath and pleuritic chest pain. A massive left-sided pleural fluid collection was seen on a chest radiograph (CXR). The pleural fluid was drained and a CT Thorax confirmed the presence of a cystic mass. Following re-accumulation of the fluid, thoracotomy was performed and a benign mediastinal teratoma excised...
January 10, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28068966/glenoid-morphology-in-light-of-anatomical-and-reverse-total-shoulder-arthroplasty-a-dissection-and-3d-ct-based-study-in-male-and-female-body-donors
#4
Sandra Mathews, Marco Burkhard, Nabil Serrano, Karl Link, Martin Häusler, Nakita Frater, Ingeborg Franke, Helena Bischofberger, Florian M Buck, Dominic Gascho, Michael Thali, Steffen Serowy, Magdalena Müller-Gerbl, Gareth Harper, Ford Qureshi, Thomas Böni, Hans-Rudolf Bloch, Oliver Ullrich, Frank-Jakobus Rühli, Elisabeth Eppler
BACKGROUND: Placement of the glenoid baseplate is of paramount importance for the outcome of anatomical and reverse total shoulder arthroplasty. However, the database around glenoid size is poor, particularly regarding small scapulae, for example, in women and smaller individuals, and is derived from different methodological approaches. In this multimodality cadaver study, we systematically examined the glenoid using morphological and 3D-CT measurements. METHODS: Measurements of the glenoid and drill hole tunnel length for superior baseplate screw placement were recorded to define size of the glenoid and the distance to the scapular notch on cadaveric specimens...
January 10, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28048862/th-e-202-02-the-use-of-hypoxia-pet-imaging-for-radiotherapy
#5
J Humm
: PET/CT is a very important imaging tool in the management of oncology patients. PET/CT has been applied for treatment planning and response evaluation in radiation therapy. This educational session will discuss: 1. Pitfalls and remedies in PET/CT imaging for RT planning 2. The use of hypoxia PET imaging for radiotherapy 3. PET for tumor response evaluation The first presentation will address the issue of mis-registration between the CT and PET images in the thorax and the abdomen. We will discuss the challenges of respiratory gating and introduce an average CT technique to improve the registration for dose calculation and image-guidance in radiation therapy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048579/su-f-t-389-validation-in-4d-dosimetry-using-dynamic-phantom
#6
C Lin, T Huang, C Lin, H Nien, P Tu, L Lui, C Wu
PURPOSE: Tumor motion due to respiration causes the uncertainties during the radiotherapy. This study aims to find the differences between planning dose by treatment planning and the received dose using dynamic phantom. METHODS: Respiratory motion was simulated by the DYNAMIC THORAX PHANTOM (Model 008A). 4D-CT scans and maximum intensity projection (MIP) images for GTV were acquired for analysis. The amplitude of craniocaudal tumor motion including 2mm, 5mm, 10mm and 20mm with 3cm2 tumor size were performed in this study...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048537/su-c-206-04-region-specific-total-variation-regularization-for-x-ray-ct-reconstruction
#7
Q Xu, H Han, L Xing
PURPOSE: Total-variation (TV) regularization methods are very effective to handle the non-sufficient data reconstruction, such as few-view problem, low-dose data, etc. Usually one single regularization parameter is employed to balance the data fidelity and the TV minimization penalty in all regions of the object. However, noise and structural details vary from region to region. Here we proposed a method to select the regularization parameter adaptively by the region specific noise. METHODS: The image was reconstructed by minimizing the data fidelity term and the TV term alternatively...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048448/su-f-e-10-student-driven-exploration-of-radiographic-material-properties-phantom-construction-and-clinical-workflows-or-the-extraordinary-life-of-candy-man
#8
R N Mahon, M J Riblett, G D Hugo
PURPOSE: To develop a hands-on learning experience that explores the radiological and structural properties of everyday items and applies this knowledge to design a simple phantom for radiotherapy exercises. METHODS: Students were asked to compile a list of readily available materials thought to have radiation attenuation properties similar to tissues within the human torso. Participants scanned samples of suggested materials and regions of interest (ROIs) were used to characterize bulk attenuation properties...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048417/th-e-202-00-pet-for-radiation-therapy
#9
Wei Lu
: PET/CT is a very important imaging tool in the management of oncology patients. PET/CT has been applied for treatment planning and response evaluation in radiation therapy. This educational session will discuss: 1. Pitfalls and remedies in PET/CT imaging for RT planning 2. The use of hypoxia PET imaging for radiotherapy 3. PET for tumor response evaluation The first presentation will address the issue of mis-registration between the CT and PET images in the thorax and the abdomen. We will discuss the challenges of respiratory gating and introduce an average CT technique to improve the registration for dose calculation and image-guidance in radiation therapy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048240/su-f-j-117-impact-of-motion-artifacts-on-image-quality-and-accuracy-of-tumor-motion-reconstruction-in-4d-ct-on-rails-and-mv-cbct-scans-a-phantom-study
#10
T Lin, C Ma
PURPOSE: To compare and quantify respiratory motion artifacts in images from free breathing 4D-CT-on-Rails(CTOR) and those from MV-Cone-beam-CT(MVCB) and facilitate respiratory motion guided radiation therapy. METHODS: 4D-CTOR: Siemens Somatom CT-on-Rails system with Anzai belt loaded with pressure sensor load cells. 4D scans were performed in helical mode, pitch 0.1, gantry rotation time 0.5s, 1.5mm slice thickness, 120kVp, 400 mAs. Normal and fast breathing (>12rpm) scanning protocols were investigated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048211/th-e-202-03-pet-for-tumor-response-evaluation
#11
W Lu
: PET/CT is a very important imaging tool in the management of oncology patients. PET/CT has been applied for treatment planning and response evaluation in radiation therapy. This educational session will discuss: 1. Pitfalls and remedies in PET/CT imaging for RT planning 2. The use of hypoxia PET imaging for radiotherapy 3. PET for tumor response evaluation The first presentation will address the issue of mis-registration between the CT and PET images in the thorax and the abdomen. We will discuss the challenges of respiratory gating and introduce an average CT technique to improve the registration for dose calculation and image-guidance in radiation therapy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048096/su-f-j-205-effect-of-cone-beam-factor-on-cone-beam-ct-number-accuracy
#12
W Yao, C Hua, J Farr, S Brady, T Merchant
PURPOSE: To examine the suitability of a Catphan™ 700 phantom for image quality QA of a cone beam computed tomography (CBCT) system deployed for proton therapy. METHODS: Catphan phantoms, particularly Catphan™ 504, are commonly used in image quality QA for CBCT. As a newer product, Catphan™ 700 offers more tissue equivalent inserts which may be useful for generating the electron density - CT number curve for CBCT based treatment planning. The sensitometry-and-geometry module used in Catphan™ 700 is located at the end of the phantom and after the resolution line pair module...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047841/tu-h-207a-04-how-patient-positioning-in-ct-affects-more-than-the-aec-image-noise-uniformity-and-ct-number-changes-as-a-function-of-positioning
#13
T Szczykutowicz, A Duplissis, D Miller
PURPOSE: Studies dealing with patient positioning in CT have mainly dealt with dose and image noise changes. For diagnosis, only dose decreases can negatively affect the diagnostic utility of the exam via an increase in image noise. However, a little studied consequence of poor positioning is CT number and noise uniformity changes. METHODS: An anthropomorphic phantom was imaged in 2 cm vertical steps between the highest and lowest couch positions. CT number and noise were measured using regions of interest (ROI) in the upper-thorax, mid-thorax, and abdomen...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047703/su-f-p-31-dosimetric-effects-of-roll-and-pitch-corrections-using-robotic-table
#14
M Mamalui, Z Su, S Flampouri, Z Li
PURPOSE: To quantify the dosimetric effect of roll and pitch corrections being performed by two types of robotic tables available at our institution: BrainLabTM 5DOF robotic table installed at VERO (BrainLab&MHI) dedicated SBRT linear accelerator and 6DOF robotic couch by IBA Proton Therapy with QFixTM couch top. METHODS: Planning study used a thorax phantom (CIRSTM), scanned at 4DCT protocol; targets (IGTV, PTV) were determined according to the institutional lung site-specific standards...
June 2016: Medical Physics
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
#15
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/28047504/su-f-j-21-clinical-evaluation-of-surface-scanning-systems-in-different-treatment-locations
#16
T Moser, S Stefanowicz, B Rhein, D Oetzel, S Adeberg, L Koenig, R Wolf, S Rieken, C Karger
PURPOSE: To reduce imaging dose in fractionated IGRT, the ability of optical surface imaging systems (OSIS) to detect setup errors was tested. Therefore, clinical studies to evaluate for different treatment locations setup corrections derived by OSIS in comparison with x-ray image guidance in fractionated radiation therapy was performed. METHODS: The setup correction accuracy of an OSIS system (AlignRT, VisionRT, London, UK) will be analysed for the 4 tumour locations Pelvis, Upper Abdomen, Thorax and Breast, 20 patients for each location in comparison to a different system (Sentinel, C-RAD, SE)...
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
#17
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/28047396/su-f-i-12-region-specific-dictionary-learning-for-low-dose-x-ray-ct-reconstruction
#18
Q Xu, H Han, L Xing
PURPOSE: Dictionary learning based method has attracted more and more attentions in low-dose CT due to the superior performance on suppressing noise and preserving structural details. Considering the structures and noise vary from region to region in one imaging object, we propose a region-specific dictionary learning method to improve the low-dose CT reconstruction. METHODS: A set of normal-dose images was used for dictionary learning. Segmentations were performed on these images, so that the training patch sets corresponding to different regions can be extracted out...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047135/su-c-206-02-estimating-coronary-artery-plaque-composition-with-a-combined-dual-energy-and-single-energy-qct-optimization-model
#19
M Goodsitt, H Chan, K Watcharotone, B Nan, E Christodoulou
PURPOSE: A study was performed to evaluate the accuracy of a combined dual-energy/single-energy QCT optimization model for estimating the volume fractions of fat, cholesterol, protein, fibrous tissue, and calcium in coronary artery plaque. METHODS: This model uses 80kVp-140kVp CT# data to distinguish calcium, and Gaussian component analysis based on the 140kVp CT#'s of the pure materials to distinguish the other constituents. An experimental study was performed with a thorax section phantom (CIRS, Inc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047071/su-f-t-634-feasibility-study-of-respiratory-gated-rapidarc-sbrt-using-a-6mv-fff-photon-beam
#20
K Dou, M Jacobs, B Laser, M Safaraz, J Rodgers
PURPOSE: To conduct a feasibility study on retrospective respiratory gating and marker tracking for lung stereotactic body radiotherapy (SBRT) with a gated RapidArc delivery using a 6MV flattened filter free photon mode. METHODS: A CIRS dynamic thorax phantom Model 008A with different inserts was used for treatment planning and respiratory gating. 4D CT had a free breathing simulation followed by a respiration gated, ten phased CT using a Philips Brilliance CT with a Varian RPM respiratory gating system...
June 2016: Medical Physics
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