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https://www.readbyqxmd.com/read/29455309/right-heart-failure-caused-by-direct-pressure-of-distal-arch-aneurysm
#1
Hironobu Sugiyama, Ryo Tohma, Takuya Misato, Kazuma Okamoto, Taro Hayashi, Satoshi Tobe, Tatsuro Matsuo, Kotaro Tsunemi, Takanori Oka, Nobuhiro Tanimura
We report a rare case of right heart failure caused by distal aortic aneurysm. Although aortopulmonary fistula is a common complication of giant aortic arch aneurysm, right heart failure caused by mechanical pressure by aneurysm is very rare. A 79-year-old female patient presented dyspnea. Contrast computed tomography (CT) of the thorax delineated a 78 mm aortic arch aneurysm pressing the main to left pulmonary artery and a 40 mm pericardial effusion at maximum depth at posterior side. Echocardiography showed the acceleration flow from main to left pulmonary artery and moderate pulmonary hypertension...
February 17, 2018: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29452203/morphology-of-the-elytral-base-sclerites
#2
Miwa Sugimoto, Naoki Ogawa, Kazunori Yoshizawa
The elytral base sclerites (= sclerites located at the articular region between the forewing and thorax in Coleoptera) of selected taxa were examined and homologized. Although the elytral base sclerites are highly modified compared to the wing base sclerites of the other neopterans, they can be homologized by using the conservative wing flapping and folding lines as landmarks. A reduction of the first axillary sclerite was identified as a general trend of the elytral base sclerites, although the sclerite usually has a very important function to mediate flight power from the notum to the wing...
February 13, 2018: Arthropod Structure & Development
https://www.readbyqxmd.com/read/29432476/the-impact-of-infrared-radiation-in-flight-control-in-the-australian-firebeetle-merimna-atrata
#3
Marcel Hinz, Adrian Klein, Anke Schmitz, Helmut Schmitz
Infrared (IR) receptors are rare in insects and have only been found in the small group of so-called pyrophilous insects, which approach forest fires. In previous work the morphology of the IR receptors and the physiology of the inherent sensory cells have been investigated. It was shown that receptors are located on the thorax and the abdomen respectively and show an astounding diversity with respect to structure and the presumed transduction mechanism. What is completely missing, however, is any behavioral evidence for the function of the IR receptors in pyrophilous insects...
2018: PloS One
https://www.readbyqxmd.com/read/29412086/an-ultralightweight-and-living-legged-robot
#4
Tat Thang Vo Doan, Melvin Y W Tan, Xuan Hien Bui, Hirotaka Sato
In this study, we describe the most ultralightweight living legged robot to date that makes it a strong candidate for a search and rescue mission. The robot is a living beetle with a wireless electronic backpack stimulator mounted on its thorax. Inheriting from the living insect, the robot employs a compliant body made of soft actuators, rigid exoskeletons, and flexure hinges. Such structure would allow the robot to easily adapt to any complex terrain due to the benefit of soft interface, self-balance, and self-adaptation of the insect without any complex controller...
February 2018: Soft Robotics
https://www.readbyqxmd.com/read/29383525/contrast-enhanced-cadaver-specific-computed-tomography-in-gross-anatomy-teaching
#5
Daniel Paech, Kerstin Klopries, Sara Doll, Ralph Nawrotzki, Heinz-Peter Schlemmer, Frederik L Giesel, Thomas Kuner
OBJECTIVES: To establish contrast-enhanced (CE) cadaver-specific post-mortem computed tomography (PMCT) in first-year gross anatomy teaching and quantitatively evaluate its learning benefit. METHODS: 132 first-year medical students were included in this IRB-approved study and randomly assigned to an intervention group (n=59) provided with continuous access to CE and non-enhanced (NE) cadaver-specific PMCT-scans during the first-semester gross anatomy course, and a control group (n=73) that had only NE cadaver-specific PMCT data available...
January 30, 2018: European Radiology
https://www.readbyqxmd.com/read/29371406/a-prospective-study-of-quantitative-spect-ct-for-evaluation-of-hepatopulmonary-shunt-fraction-prior-to-sirt-of-liver-tumors
#6
Helmut J M H Dittmann, Daniel Kopp, Juergen Kupferschlaeger, Diana Feil, Gerd Groezinger, Roland Syha, Matthias Weissinger, Christian La Fougère
Hepatopulmonary shunt fraction (LSF)-estimation using Tc-99m-Macroalbumine (MAA) imaging is performed prior to selective internal radiotherapy (SIRT) of the liver in order to reduce risk of pulmonary irradiation burden. Generally, planar scans are acquired after injection of MAA into the hepatic artery. However, validity of this approach is limited by different attenuation of liver and lung tissue as well as inaccurate segmentation of the organs. Aim of this study was to evaluate quantitative SPECT/CT for LSF-assessment in a prospective clinical cohort...
January 25, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29350048/triple-split-bolus-versus-single-bolus-ct-in-abdominal-trauma-patients-a-comparative-study
#7
Johannes Clemens Godt, Torsten Eken, Anselm Schulz, Cathrine K Johansen, Anette Aarsnes, Johann Baptist Dormagen
Background Split-bolus computed tomography (CT) is a recent development in trauma imaging. Instead of multiple scans in different contrast phases after a single contrast bolus, split-bolus protocols consist of one single scan of the thorax and abdomen after two or three contrast injections at different points of time. Purpose To evaluate and compare image quality and injury findings of a new triple-split-bolus CT (TS-CT) protocol of thorax and abdomen with those of a portal venous phase CT (PV-CT) in the same patient group...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29332497/dosimetric-analysis-of-microscopic-disease-in-sbrt-for-lung-cancers
#8
Ronghu Mao, Lingling Tian, You Zhang, Lei Ren, Renqi Gao, Fang-Fang Yin, Hong Ge
OBJECTIVE: The objective of this study is to theoretically and experimentally evaluate the dosimetry in the microscopic disease regions surrounding the tumor under stereotactic body radiation therapy of lung cancer. METHODS: For simplicity, the tumor was considered moving along 1 dimension with a periodic function. The probability distribution function of the tumor position was generated according to the motion pattern and was used to estimate the delivered dose in the microscopic disease region...
December 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29319039/anaplastic-large-cell-lymphoma-presenting-as-bilateral-endobronchial-tumor-in-a-young-boy
#9
Abhijeet Dharmaji Sawant, Vijayraj S Patil, Pranjal M Gugalia, Rajiv Kumar, Sabita Jiwnani, George Karimundackal, C S Pramesh
A 15-year-old boy presented to us with a 4-month history of fever with worsening dyspnea since 1 month. His contrast-enhanced computed tomography scan of the thorax showed bilateral endobronchial lesions with complete collapse-consolidation of the left lung and partial collapse of the right lower lobe. His fiberoptic bronchoscopy guided biopsy had been reported in outside hospital as a neuroendocrine tumor. Due to worsening breathlessness, he had to be intubated. We repeated the endobronchial biopsy and combined with outside slides and blocks, was diagnosed to have an anaplastic lymphoma kinase-1 positive anaplastic large cell lymphoma (ALCL)...
January 2018: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/29248738/identification-of-immature-stages-of-phlebotomine-sand-flies-using-maldi-tof-ms-and-mapping-of-mass-spectra-during-sand-fly-life-cycle
#10
Petr Halada, Kristyna Hlavackova, Vit Dvorak, Petr Volf
The aim of the study was to evaluate the potential of matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) for the species identification of sand flies at different developmental stages and map changes in their protein profiles during the course of whole life cycle. Specimens of six different species from laboratory colonies at larval and pupal stages were examined using MALDI-TOF MS. The protein profiles of larvae were stable from the L2 to L4 developmental stages and clearly distinguishable at the species level...
December 14, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29226123/open-repair-of-a-12-cm-posttraumatic-aneurysm-of-right-subclavian-artery
#11
Konstantinos Tigkiropoulos, Omiros Chalvatzoulis, Eleftherios Chalvatzoulis, Kyriakos Stavridis, Dimitrios Karamanos, Ioannis Lazaridis, Andreas Efstathiou, Nikolaos Saratzis
Purpose: To present a rare case of a patient with a 12-cm posttraumatic right subclavian artery aneurysm successfully treated with aneurysmectomy and innominate-axillary bypass. Case report: A 54-year-old man presented to the emergency department due to progressive dyspnea and hoarseness of voice. His medical record was unremarkable except that he had right-sided pneumothorax and multiple rib fractures from a car accident 16 years ago. A chest X-ray showed a mass in the upper lobe of the right lung, and the patient was hospitalized for further investigation...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/29218226/hamman-s-syndrome-in-diabetic-ketoacidosis
#12
Alexandra Rose Pain, Josh Pomroy, Andrea Benjamin
Hamman's syndrome (spontaneous subcutaneous emphysema and pneumomediastinum) is a rare complication of diabetic ketoacidosis (DKA), with a multifactorial etiology. Awareness of this syndrome is important: it is likely underdiagnosed as the main symptom of shortness of breath is often attributed to Kussmaul's breathing and the findings on chest radiograph can be subtle and easily missed. It is also important to be aware of and consider Boerhaave's syndrome as a differential diagnosis, a more serious condition with a 40% mortality rate when diagnosis is delayed...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/29179706/intralobar-pulmonary-sequestration-expanding-toward-the-contralateral-thorax-two-case-reports
#13
Hizuru Amano, Jun Fujishiro, Akinari Hinoki, Hiroo Uchida
BACKGROUND: Intralobar pulmonary sequestration (ILS) is defined as a portion of parenchyma that is contained within the normal pleural investment of the lung but not connected to the tracheobronchial tree, and supplied by anomalous systemic arteries. As ILS is enveloped within the lobe of the normal lung, it is extremely rare for ILS to invade into the mediastinum. We report two atypical cases of infants with ILS expanded toward the posterior mediastinum and contralateral thorax through the pulmonary ligament...
November 28, 2017: BMC Surgery
https://www.readbyqxmd.com/read/29178486/developing-and-characterizing-mr-ct-visible-materials-used-in-qa-phantoms-for-mrgrt-systems
#14
Angela Steinmann, R Jason Stafford, Gabriel Sawakuchi, Zhifei Wen, Laurence Court, Clifton D Fuller, David Followill
PURPOSE: Synthetic tissue equivalent (STE) materials currently used to simulate tumor and surrounding tissues for IROC-Houston's anthropomorphic head and thorax QA phantoms cannot be visualized using magnetic resonance (MR) imaging. The purpose of this study was to characterize dual MR/CT visible STE materials that can be used in an end-to-end QA phantom for MR guided radiotherapy (MRgRT) modalities. METHODS: Over 80 materials' MR, CT, and dosimetric STE properties were investigated for use in MRgRT QA phantoms...
November 27, 2017: Medical Physics
https://www.readbyqxmd.com/read/29145905/-a-girl-with-a-tumour-on-the-thorax
#15
M B Notenboom-Kool, W Opstelten
A healthy 1-year old girl visits her general practitioner with a solitary dome-shaped tumour on her thorax. The lesion is about one cm in diameter and is present since several months. Pathological research reveals a solitary giant molluscum contagiosum. This is a common viral disease of the childhood. In contrast to this case, mollusca contagiosa typically present as several small papules.
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28987652/dual-energy-computed-tomography-in-patients-with-cutaneous-malignant-melanoma-comparison-of-noise-optimized-and-traditional-virtual-monoenergetic-imaging
#16
Simon S Martin, Julian L Wichmann, Hendrik Weyer, Moritz H Albrecht, Tommaso D'Angelo, Doris Leithner, Lukas Lenga, Christian Booz, Jan-Erik Scholtz, Boris Bodelle, Thomas J Vogl, Renate Hammerstingl
OBJECTIVE: The aim of this study was to investigate the impact of noise-optimized virtual monoenergetic imaging (VMI+) reconstructions on quantitative and qualitative image parameters in patients with cutaneous malignant melanoma at thoracoabdominal dual-energy computed tomography (DECT). MATERIALS AND METHODS: Seventy-six patients (48 men; 66.6±13.8years) with metastatic cutaneous malignant melanoma underwent DECT of the thorax and abdomen. Images were post-processed with standard linear blending (M_0...
October 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28941215/analysis-of-testing-with-multiple-choice-versus-open-ended-questions-outcome-based-observations-in-an-anatomy-course
#17
Cheryl A Melovitz Vasan, David O DeFouw, Bart K Holland, Nagaswami S Vasan
The pedagogical approach for both didactic and laboratory teaching of anatomy has changed in the last 25 years and continues to evolve; however, assessment of student anatomical knowledge has not changed despite the awareness of Bloom's taxonomy. For economic reasons most schools rely on multiple choice questions (MCQ) that test knowledge mastered while competences such as critical thinking and skill development are not typically assessed. In contrast, open-ended question (OEQ) examinations demand knowledge construction and a higher order of thinking, but more time is required from the faculty to score the constructed responses...
September 22, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28937491/improved-calcium-scoring-at-dual-energy-computed-tomography-angiography-using-a-high-z-contrast-element-and-novel-material-separation-technique
#18
Jack W Lambert, Yuxin Sun, Karen G Ordovas, Robert G Gould, Sizhe Wang, Benjamin M Yeh
OBJECTIVES: The aim of this study was to compare the accuracy of existing dual-energy computed tomography (CT) angiography coronary artery calcium scoring methods to those obtained using an experimental tungsten-based contrast material and a recently described contrast material extraction process (CMEP). METHODS: Phantom coronary arteries of varied diameters, with different densities and arcs of simulated calcified plaque, were sequentially filled with water, iodine, and tungsten contrast materials and scanned within a thorax phantom at rapid-kVp-switching dual-energy CT...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28929810/dynamic-contrast-enhanced-perfusion-area-detector-ct-preliminary-comparison-of-diagnostic-performance-for-n-stage-assessment-with-fdg-pet-ct-in-non-small-cell-lung-cancer
#19
COMPARATIVE STUDY
Yoshiharu Ohno, Yasuko Fujisawa, Naoki Sugihara, Yuji Kishida, Shinichiro Seki, Hisanobu Koyama, Takeshi Yoshikawa
OBJECTIVE: The objective of our study was to directly compare the capability of dynamic first-pass contrast-enhanced (CE) perfusion area-detector CT (ADCT) and FDG PET/CT for differentiation of metastatic from nonmetastatic lymph nodes and assessment of N stage in patients with non-small cell lung carcinoma (NSCLC). SUBJECTS AND METHODS: Seventy-seven consecutive patients, 45 men (mean age ± SD, 70.4 ± 5.9 years) and 32 women (71.2 ± 7.7 years), underwent dynamic first-pass CE-perfusion ADCT at two or three different positions for covering the entire thorax, FDG PET/CT, surgical treatment, and pathologic examination...
November 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28901616/regularization-of-nonlinear-decomposition-of-spectral-x-ray-projection-images
#20
Nicolas Ducros, Juan Felipe Perez-Juste Abascal, Bruno Sixou, Simon Rit, Françoise Peyrin
PURPOSE: Exploiting the x-ray measurements obtained in different energy bins, spectral computed tomography (CT) has the ability to recover the 3-D description of a patient in a material basis. This may be achieved solving two subproblems, namely the material decomposition and the tomographic reconstruction problems. In this work, we address the material decomposition of spectral x-ray projection images, which is a nonlinear ill-posed problem. METHODS: Our main contribution is to introduce a material-dependent spatial regularization in the projection domain...
September 2017: Medical Physics
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