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https://www.readbyqxmd.com/read/28047768/th-ab-207a-06-the-use-of-realistic-phantoms-to-predict-ct-dose-to-pediatric-patients
#1
D Carver, S Kost, P Segars, N Fraser, D Pickens, R Price, M Stabin
PURPOSE: To predict pediatric patient dose from diagnostic CT scans using Monte Carlo simulation of realistic reference phantoms of various ages, weights, and heights. METHODS: A series of deformable pediatric reference phantoms using Non-Uniform Rational B-Splines (NURBS) was developed for a large range of ages, percentiles, and reference anatomy. Individual bones were modeled using age-dependent factors, and red marrow was modeled as functions of age and spatial distribution based on Cristy1...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046639/su-f-t-85-energy-modulated-electron-postmastectomy-unreconstructed-pu-chest-wall-cw-irradiation-technique-to-achieve-heart-sparing
#2
L Hong, A Ballangrud, B McCormick, J Mechalakos
PURPOSE: For left-sided PU patients requiring CW and nodal irradiation, sometimes partial wide tangents (PWT) are not feasible due to abnormal chest wall contour or heart position close to the anterior chest wall or unusual wide excision scar. We developed an energy modulated electron chest wall irradiation technique that will achieve heart sparing. METHODS: Ten left-sided PU patients were selected for this dosimetry study. If PWT were used, the amount of the ipsilateral lung would be ranged 3...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046630/su-f-t-114-a-novel-anatomically-predictive-extension-model-of-computational-human-phantoms-for-dose-reconstruction-in-retrospective-epidemiological-studies-of-second-cancer-risks-in-radiotherapy-patients
#3
G Kuzmin, C Lee, C Lee, C Pelletier, J Jung
PURPOSE: Recent advances in cancer treatments have greatly increased the likelihood of post-treatment patient survival. Secondary malignancies, however, have become a growing concern. Epidemiological studies determining secondary effects in radiotherapy patients require assessment of organ-specific dose both inside and outside the treatment field. An essential input for Monte Carlo modeling of particle transport is radiological images showing full patient anatomy. However, in retrospective studies it is typical to only have partial anatomy from CT scans used during treatment planning...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046024/chest-fat-quantification-via-ct-based-on-standardized-anatomy-space-in-adult-lung-transplant-candidates
#4
Yubing Tong, Jayaram K Udupa, Drew A Torigian, Dewey Odhner, Caiyun Wu, Gargi Pednekar, Scott Palmer, Anna Rozenshtein, Melissa A Shirk, John D Newell, Mary Porteous, Joshua M Diamond, Jason D Christie, David J Lederer
PURPOSE: Overweight and underweight conditions are considered relative contraindications to lung transplantation due to their association with excess mortality. Yet, recent work suggests that body mass index (BMI) does not accurately reflect adipose tissue mass in adults with advanced lung diseases. Alternative and more accurate measures of adiposity are needed. Chest fat estimation by routine computed tomography (CT) imaging may therefore be important for identifying high-risk lung transplant candidates...
2017: PloS One
https://www.readbyqxmd.com/read/28009797/what-s-new-in-congenital-scoliosis
#5
Joshua M Pahys, James T Guille
BACKGROUND: Congenital scoliosis is a failure of vertebral formation, segmentation, or a combination of the 2 arising from abnormal vertebral development during weeks 4 to 6 of gestation. The associated spinal deformity can be of varying severity and result in a stable or progressive deformity based on the type and location of the anomalous vertebra(e). Bracing for congenital scoliosis is rarely indicated, while recent reports have demonstrated the utility of serial derotational casting for longer curves with multiple anomalous vertebrae as an effective "time buying strategy" to delay the need for surgery...
December 22, 2016: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/27991695/application-of-extended-bi-pedicle-anterolateral-thigh-free-flaps-for-reconstruction-of-large-defects-a-case-series
#6
Michele Maruccia, Georgios Orfaniotis, Pedro Ciudad, Fabio Nicoli, Emanuele Cigna, Giuseppe Giudice, Kidakorn Kiranantawat, Diego Ribuffo, Hung-Chi Chen
BACKGROUND: The anterolateral thigh flap is a workforce flap in reconstructive surgery, however, variations in it is vascular anatomy are not uncommon. These variations may affect flap design and survival, especially when large flaps are required. In some anatomical variants the anterolateral thigh flap is supplied by two separate dominant pedicles, and in these cases a bi-pedicle modification may be necessary to ensure complete flap viability. The aim of this report is to evaluate the outcomes, and present our approach in using bi-pedicle anterolateral thigh flaps as a method to reduce the risk of partial flap necrosis when reconstructing sizeable soft tissue defects...
December 19, 2016: Microsurgery
https://www.readbyqxmd.com/read/27990701/maintained-right-ventricular-pressure-overload-induces-ventricular-arterial-decoupling-in-mice
#7
Mario Boehm, Allan Lawrie, Jochen Wilhelm, Hossein A Ghofrani, Friedrich Grimminger, Norbert Weissmann, Werner Seeger, Ralph T Schermuly, Baktybek Kojonazarov
Assessment of right ventricular (RV) function in rodents is a challenge due to the complex RV anatomy and structure. Subsequently, the best characterization of RV function is achieved by accurate cardiovascular phenotyping, involving a combination of non-invasive imaging and intra-cardiac pressure-volume measurements. We sought to investigate the feasibility of two complementary phenotyping techniques for the evaluation of RV function in an experimental mouse model of sustained RV pressure overload. Mice underwent either Sham surgery (n = 5) or pulmonary artery banding (PAB) (n = 8) to induce isolated RV pressure overload...
December 19, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27989256/junctional-tachycardia-in-a-child-with-non-rheumatic-fever-streptococcal-pharyngitis
#8
Neha Bansal, Peter P Karpawich, Chenni S Sriram
Accelerated junctional rhythm has been reported in children in the setting of acute rheumatic fever; however, we describe a hitherto unreported case of isolated junctional tachycardia in a child with streptococcal pharyngitis, not meeting revised Jones criteria for rheumatic fever. A previously healthy, 9-year-old girl presented to the emergency department with complaints of sore throat, low-grade fever, and intermittent chest pain. She was found to have a positive rapid streptococcal antigen test. The initial electrocardiogram showed junctional tachycardia with atrioventricular dissociation in addition to prolonged and aberrant atrioventricular conduction...
December 19, 2016: Cardiology in the Young
https://www.readbyqxmd.com/read/27986379/lung-nodule-classification-using-deep-feature-fusion-in-chest-radiography
#9
Changmiao Wang, Ahmed Elazab, Jianhuang Wu, Qingmao Hu
Lung nodules are small, round, or oval-shaped masses of tissue in the lung region. Early diagnosis and treatment of lung nodules can significantly improve the quality of patients' lives. Because of their small size and the interlaced nature of chest anatomy, detection of lung nodules using different medical imaging techniques becomes challenging. Recently, several methods for computer aided diagnosis (CAD) were proposed to improve the detection of lung nodules with good performances. However, the current methods are unable to achieve high sensitivity and high specificity...
November 12, 2016: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/27984449/operative-treatment-of-rib-fractures-in-flail-chest-injuries-a-meta-analysis-and-cost-effectiveness-analysis
#10
Eric Swart, Joseph Laratta, Gerard Slobogean, Samir Mehta
OBJECTIVES: Flail chest is a common injury sustained by patients who suffer from high energy blunt chest trauma, and results in severe respiratory compromise due to altered mechanics of respiration. There has been increased interest in operative fixation of these injuries with the intention of restoring the mechanical integrity of the chest wall, and several studies have shown that ventilation requirements and pulmonary complications may be decreased with operative intervention. The purpose of this study was to evaluate fixation of rib fractures in flail chest injuries using cost effectiveness analysis, supported by systematic review and meta-analysis...
November 16, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27974976/sinus-venosus-atrial-septal-defect-complicated-by-eisenmenger-syndrome-and-the-role-of-vasodilator-therapy
#11
Amornpol Anuwatworn, Maheedhar Gedela, Edgard Bendaly, Julia A Prescott-Focht, Jimmy Yee, Richard Clark, Orvar Jonsson
Sinus venosus atrial septal defect is a rare congenital, interatrial communication defect at the junction of the right atrium and the vena cava. It accounts for 5-10% of cases of all atrial septal defects. Due to the rare prevalence and anatomical complexity, diagnosing sinus venous atrial septal defects poses clinical challenges which may delay diagnosis and treatment. Advanced cardiac imaging studies are useful tools to diagnose this clinical entity and to delineate the anatomy and any associated communications...
2016: Case Reports in Cardiology
https://www.readbyqxmd.com/read/27904536/a-review-on-human-respiratory-modeling
#12
REVIEW
Pardis Ghafarian, Hamidreza Jamaati, Seyed Mohammadreza Hashemian
Input impedance of the respiratory system is measured by forced oscillation technique (FOT). Multiple prior studies have attempted to match the electromechanical models of the respiratory system to impedance data. Since the mechanical behavior of airways and the respiratory system as a whole are similar to an electrical circuit in a combination of series and parallel formats some theories were introduced according to this issue. It should be noted that, the number of elements used in these models might be less than those required due to the complexity of the pulmonary-chest wall anatomy...
2016: Tanaffos
https://www.readbyqxmd.com/read/27888758/left-atrium-and-pulmonary-vein-imaging-using-sub-millisiviert-cardiac-computed-tomography-impact-on-radiofrequency-catheter-ablation-cumulative-radiation-exposure-and-outcome-in-atrial-fibrillation-patients
#13
Gianluca Pontone, Daniele Andreini, Maria Petulla, Andrea Annoni, Andrea I Guaricci, Ester Innocenti, Eleonora Russo, Marco Guglielmo, Saima Mushtaq, Andrea Baggiano, Virginia Beltrama, Laura Fusini, Chiara Segurini, Edoardo Conte, Alberto Formenti, Gaetano Fassini, Stefania Riva, Claudio Tondo, Piergiuseppe Agostoni, Antonio L Bartorelli, Mauro Pepi
BACKGROUND: The outcome of radiofrequency catheter ablation (RFCA) of atrial fibrillation (AF) has improved thanks to left atrium (LA) anatomy reconstruction by cardiac computed tomography (CCT). A new model-based iterative reconstruction algorithm (MBIR) provides image noise reduction achieving effective radiation dose (ED) close to chest X-ray exposure. Aim of this study was comparing RFCA procedural characteristics, AF recurrence and radiation exposure between patients in whom RFCA was guided by CCT image integration with MBIR versus a CCT standard protocol...
February 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/27884419/a-novel-deep-inspiration-maneuver-for-difficult-transseptal-puncture
#14
Tolga Aksu, Tumer Erdem Guler, Kivanc Yalin, Sukriye Ebru Golcuk, Kazim Serhan Ozcan, Niyazi Guler
Transseptal puncture (TSP) may not be possible in cases of an elastic, aneurysmal, or thickened interatrial septum (IAS). During deep inspiration (DI), the chest wall expands and the diaphragm descends. This makes intrapleural pressure to become more negative, which leads to movement of the IAS to the right side. The aim of this study was to verify prospectively the feasibility, safety, and outcome of DI associated with conventional TSP technique in patients with challenging IAS anatomy. From September 2012 to May 2016, 224 patients underwent TSP due to different indications...
February 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/27870822/comparison-of-total-lung-capacity-determined-by-plethysmography-with-computed-tomographic-segmentation-using-caliper
#15
Andrew J Matsumoto, Brian J Bartholmai, Mark E Wylam
PURPOSE: Traditionally, determination of total lung capacity (TLC) by plethysmography (TLCpleth) has been important in the diagnosis of lung diseases. Alternatively, data acquired from computerized tomography (CT) can be utilized to calculate a measure of TLC (TLCCT). The clinical utility of TLCCT is not certain. We sought to determine, in a clinical setting, whether TLCCT correlates with TLCpleth across a range of lung diseases and scanning techniques. In addition, we determined whether TLCCT affects the interpretation of pulmonary function tests...
November 18, 2016: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/27867587/acute-chest-pain-in-a-triathlete-rupture-of-the-noncoronary-sinus-of-valsalva-into-the-right-ventricle
#16
Ernan Zhu, Ralf Westenfeld, Mareike Gastl, Florian Bönner, Alexander Assmann, Amir M Nia, Malte Kelm, Christian Jung
Sinus of Valsalva (SoV) aneurysm is a rare cardiac disease which can be congenital or acquired. A ruptured SoV aneurysm presents a clinical emergency and can lead to progressively deteriorating heart failure. Therefore, appropriate treatment requires prompt and accurate diagnosis. Most ruptured or nonruptured SoV aneurysms are diagnosed by the means of echocardiography. However, cardiovascular magnetic resonance (CMR) can provide information on precise anatomy and mechanisms due to its excellent soft tissue contrast and high resolution, and thereby allows for optimized preoperative planning of the repair strategy...
October 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27843802/coronary-ectasia-in-a-man-on-breast-cancer-therapy-presenting-with-acute-coronary-syndrome
#17
Dana C Johnson, Luay Rifai, Parag V Patel
Limited data exist on the association between breast cancer treatments and coronary artery disease anatomy, particularly in males. We describe an unusual case of diffuse coronary ectasia in a man with breast cancer presenting with acute coronary syndrome (ACS). A 66-year-old man with breast cancer on paclitaxel, tamoxifen, and carboplatin chemotherapy regimen, presents with new onset chest pain. Electrocardiogram reveals anterolateral ST-segment depressions and elevated troponin I level. Emergent angiography revealed grossly ectatic coronary arteries with a total thrombotic occlusion of the mid right coronary artery...
October 2016: Avicenna Journal of Medicine
https://www.readbyqxmd.com/read/27800204/left-sided-upper-partial-anomalous-pulmonary-venous-return-through-a-curved-vein-joining-the-left-brachiocephalic-vein
#18
Eleonora Tricarico, Francesco Tricarico, Carlo Florio
The evaluation of pulmonary veins during cross-sectional imaging of the chest and the knowledge of their embryology and anatomy are useful for detecting congenital conditions that may be clinically significant. Moreover, with the spread of cross-sectional imaging it is very frequent to find anatomical variants; therefore the radiologist should easily recognize their appearances. This case report shows a left-side upper partial anomalous pulmonary venous return (PAPVR) through a "curved" vein that joins the left brachiocephalic vein, in a female patient who underwent whole-body computed tomography (CT) for staging endometrial cancer...
2016: Case Reports in Radiology
https://www.readbyqxmd.com/read/27799028/right-heart-catheterization-through-persistent-left-superior-vena-cava-an-extremely-rare-procedure-and-review-of-current-literature
#19
Abdel Rahman Al Emam, Ahmed Abuzaid, Mohammad Chamsi Pasha
Persistent left superior vena cava (PLSVC) is encountered occasionally during angiographic procedures. It usually coexists with right superior vena cava and drains to the right atrium through the coronary sinus, but multiple variations are described. Although PLSVC is extensively reported in the literature, there are very few articles addressing right heart catheterization in patients with isolated PLSVC. We present a patient with absent right superior vena cava and PLSVC draining to a dilated coronary sinus diagnosed during right heart catheterization in the setting of pulmonary hypertension...
October 28, 2016: Current Cardiology Reviews
https://www.readbyqxmd.com/read/27785539/computed-tomography-and-upper-gastrointestinal-series-findings-of-esophageal-bronchi-in-infants
#20
Gabrielle C Colleran, Ciara E Ryan, Edward Y Lee, Brian Sweeney, David Rea, Clare Brenner
BACKGROUND: Esophageal bronchus is a rare form of communicating bronchopulmonary foregut malformation and a rare but important cause of an opaque hemithorax on chest radiography. A higher incidence of esophageal bronchus is associated with esophageal atresia, tracheo-esophageal fistula (TEF) and VACTERL (vertebral defects, anal atresia, cardiac defects, tracheo-esophageal fistula, renal anomalies, and limb abnormalities) association. In the presence of these conditions, the pediatric radiologist may be the first to consider the diagnosis of esophageal bronchus or esophageal lung...
October 26, 2016: Pediatric Radiology
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