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https://www.readbyqxmd.com/read/28316979/a-registration-method-based-on-contour-point-cloud-for-3d-whole-body-pet-and-ct-images
#1
Zhiying Song, Huiyan Jiang, Qiyao Yang, Zhiguo Wang, Guoxu Zhang
The PET and CT fusion image, combining the anatomical and functional information, has important clinical meaning. An effective registration of PET and CT images is the basis of image fusion. This paper presents a multithread registration method based on contour point cloud for 3D whole-body PET and CT images. Firstly, a geometric feature-based segmentation (GFS) method and a dynamic threshold denoising (DTD) method are creatively proposed to preprocess CT and PET images, respectively. Next, a new automated trunk slices extraction method is presented for extracting feature point clouds...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28298110/near-infrared-overtone-voh-2-%C3%A2-0-spectroscopy-of-ne-h2o-clusters
#2
Michael P Ziemkiewicz, Christian Pluetzer, Michael Wojcik, Jérôme Loreau, Ad van der Avoird, David J Nesbitt
Vibrationally state selective overtone spectroscopy and dynamics of weakly bound Ne-H2O complexes (D0((para)) = 31.67 cm(-1), D0((ortho)) = 34.66 cm(-1)) are reported for the first time, based on near infrared excitation of van der Waals cluster bands correlating with vOH = 2 ← 0 overtone transitions (|02(-)⟩←|00(+)⟩ and |02(+)⟩←|00(+)⟩) out of the ortho (101) and para (000) internal rotor states of the H2O moiety. Quantum theoretical calculations for nuclear motion on a high level ab initio potential energy surface (CCSD(T)/VnZ-f12 (n = 3,4), corrected for basis set superposition error and extrapolated to the complete basis set limit) are employed for assignment of Σ←Σ,Π←Σ, and Σ←Π infrared bands in the overtone spectra, where Σ(K = 0) and Π (K = 1) represent approximate projections (K) of the body angular momentum along the Ne-H2O internuclear axis...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28297341/assessment-of-monte-carlo-algorithm-for-compliance-with-rtog-0915-dosimetric-criteria-in-peripheral-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy
#3
Damodar Pokhrel, Sumit Sood, Rajeev Badkul, Hongyu Jiang, Christopher McClinton, Christopher Lominska, Parvesh Kumar, Fen Wang
The purpose of the study was to evaluate Monte Carlo-generated dose distributions with the X-ray Voxel Monte Carlo (XVMC) algorithm in the treatment of peripheral lung cancer patients using stereotactic body radiotherapy (SBRT) with non-protocol dose-volume normalization and to assess plan outcomes utilizing RTOG 0915 dosimetric compliance criteria. The Radiation Therapy Oncology Group (RTOG) protocols for non-small cell lung cancer (NSCLC) currently require radiation dose to be calculated using tissue density heterogeneity corrections...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297331/comparison-of-surface-matching-and-target-matching-for-image-guided-pelvic-radiation-therapy-for-both-supine-and-prone-patient-positions
#4
Hui Zhao, Brian Wang, Vikren Sarkar, Prema Rassiah-Szegedi, Y Jessica Huang, Martin Szegedi, Long Huang, Victor Gonzalez, Bill Salter
We investigate the difference between surface matching and target matching for pelvic radiation image guidance. The uniqueness of our study is that all patients have multiple CT-on-rails (CTOR) scans to compare to corresponding AlignRT images. Ten patients receiving pelvic radiation were enrolled in this study. Two simulation CT scans were performed in supine and prone positions for each patient. Body surface contours were generated in treatment planning system and exported to AlignRT to serve as reference images...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296333/automated-calculation-of-water-equivalent-diameter-dw-based-on-aapm-task-group-220
#5
Choirul Anam, Freddy Haryanto, Rena Widita, Idam Arif, Geoff Dougherty
The purpose of this study is to accurately and effectively automate the calculation of the water-equivalent diameter (DW) from 3D CT images for estimating the size-specific dose. DW is the metric that characterizes the patient size and attenuation. In this study, DW was calculated for standard CTDI phantoms and patient images. Two types of phantom were used, one representing the head with a diameter of 16 cm and the other representing the body with a diameter of 32 cm. Images of 63 patients were also taken, 32 who had undergone a CT head examination and 31 who had undergone a CT thorax examination...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295413/using-a-handheld-stereo-depth-camera-to-overcome-limited-field-of-view-in-simulation-imaging-for-radiation-therapy-treatment-planning
#6
Cesare Jenkins, Lei Xing, Amy Yu
PURPOSE: A correct body contour is essential for reliable treatment planning in radiation therapy. While modern medical imaging technologies provide highly accurate patient modeling, there are times when a patient's anatomy cannot be fully captured or there is a lack of easy access to computed tomography (CT) simulation. Here we provide a practical solution to the surface contour truncation problem by using a handheld stereo depth camera (HSDC) to obtain the missing surface anatomy and a surface-surface image registration to stich the surface data into the CT dataset for treatment planning...
March 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28291932/online-dosimetric-evaluation-of-larynx-sbrt-a-pilot-study-to-assess-the-necessity-of-adaptive-replanning
#7
Weihua Mao, Timothy Rozario, Weiguo Lu, Xuejun Gu, Yulong Yan, Xun Jia, Baran Sumer, David L Schwartz
PURPOSE: We have initiated a multi-institutional phase I trial of 5-fraction stereotactic body radiotherapy (SBRT) for Stage III-IVa laryngeal cancer. We conducted this pilot dosimetric study to confirm potential utility of online adaptive replanning to preserve treatment quality. METHODS: We evaluated ten cases: five patients enrolled onto the current trial and five patients enrolled onto a separate phase I SBRT trial for early-stage glottic larynx cancer. Baseline SBRT treatment plans were generated per protocol...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28291927/single-fraction-radiosurgery-stereotactic-body-radiation-therapy-sbrt-for-spine-metastasis-a-dosimetric-comparison-of-multiple-delivery-platforms
#8
Adrian Nalichowski, Isaac Kaufman, John Gallo, Todd Bossenberger, Tim Solberg, Ezequiel Ramirez, Yulong Yan, Julie Fredrick, Tewfik Bichay, Alan Mayville, Jay Burmeister
There are numerous commercial radiotherapy systems capable of delivering single fraction spine radiosurgery/SBRT. We aim to compare the capabilities of several of these systems to deliver this treatment when following standardized criteria from a national protocol. Four distinct target lesions representing various case presentations of spine metastases were contoured in both the thoracic and lumbar spine of an anthropomorphic SBRT phantom. Single fraction radiosurgery/SBRT plans were designed for each target with each of our treatment platforms...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28279831/inverse-relationship-between-the-body-mass-index-and-severity-of-carotid-siphon-calcifications-another-obesity-paradox-results-from-the-atahualpa-project
#9
Oscar H Del Brutto, Robertino M Mera
BACKGROUND AND AIMS: The importance of the obesity paradox in the intracranial vasculature has not been explored. We assessed whether the body mass index (BMI) correlates with severity of carotid siphon calcifications (CSC) in community-dwelling adults. METHODS: Using a population-based study design, Atahualpa residents aged ≥40 years underwent head computed tomography (CT) for assessment of CSC. We evaluated the association between BMI and severity of CSC (dependent variable) using regression models adjusted for demographics and cardiovascular risk factors...
February 27, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28273341/still-equivalent-for-dose-calculation-in-the-monte-carlo-era-a-comparison-of-free-breathing-and-average-intensity-projection-ct-datasets-for-lung-sbrt-using-three-generations-of-dose-calculation-algorithms
#10
Kristina Zvolanek, Rongtao Ma, Christina Zhou, Xiaoying Liang, Shuo Wang, Vivek Verma, Xiaofeng Zhu, Qinghui Zhang, Joseph Driewer, Chi Lin, Weining Zhen, Andrew Wahl, Su-Min Zhou, Dandan Zheng
PURPOSE: Inhomogeneity dose modeling and respiratory motion description are two critical technical challenges for lung stereotactic body radiotherapy, an important treatment modality for small size primary and secondary lung tumors. Recent studies revealed lung density-dependent target dose differences between Monte Carlo (Type-C) algorithm and earlier algorithms. Therefore, this study aimed to investigate the equivalence of the two most popular CT datasets for treatment planning, free breathing (FB) and average intensity projection (AIP) CTs, using Type-C algorithms, and comparing with two older generation algorithms (Type-A and Type-B)...
March 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28272275/the-lipo-body-lift-a-new-circumferential-body-contouring-technique-useful-after-bariatric-surgery
#11
Sandy Dast, Christian Herlin, Richard Vaucher, Razvan Mercut, Lidia Dessena, Raphael Sinna
No abstract text is available yet for this article.
March 7, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28260937/the-role-of-inflammation-in-adipocytolytic-nonsurgical-esthetic-procedures-for-body-contouring
#12
REVIEW
Jonathas Xavier Pereira, Yuri Cavalcante, Riane Wanzeler de Oliveira
BACKGROUND: The adipocytolytic non-surgical esthetic procedures are indicated for the reduction of localized fat and are effective in reducing local adiposity through the ablation of adipocytes with fast and lasting results, besides causing local inflammation. OBJECTIVE: This study aimed to characterize the adipocytolytic procedures and correlate the phases of the inflammatory process with the results obtained from such procedures, in order to clarify the role of inflammation triggered by the adipocytolytic procedures and its relation with the lipolytic process, with a focus on body shaping...
2017: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/28259558/patient-satisfaction-body-image-and-quality-of-life-after-lower-body-lift-a-prospective-pre-and-postoperative-long-term-survey
#13
Martin F Vierhapper, Anna Pittermann, Stefan Hacker, Hugo B Kitzinger
BACKGROUND: Body contouring surgery after massive weight loss remains a fast growing field due to the rising number of postbariatric surgery patients, and it can improve patients' quality of life substantially. Patient expectations in these procedures are very high, but only little is known as to whether these procedures have a long lasting influence on body image, patient satisfaction, and quality of life. SETTING: University hospital, Austria. METHODS: We evaluated 40 consecutive female patients who underwent a lower body lift between 2009 and 2013...
January 11, 2017: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/28252445/comparing-the-dosimetric-impact-of-interfractional-anatomical-changes-in-photon-proton-and-carbon-ion-radiotherapy-for-pancreatic-cancer-patients
#14
Antonetta C Houweling, Koen Crama, Jorrit Visser, Kyohei Fukata, Coen R N Rasch, Tatsuya Ohno, Arjan Bel, Astrid van der Horst
Radiotherapy using charged particles is characterized by a low dose to the surrounding healthy organs, while delivering a high dose to the tumor. However, interfractional anatomical changes can greatly affect the robustness of particle therapy. Therefore, we compared the dosimetric impact of interfractional anatomical changes (i.e. body contour differences and gastrointestinal gas volume changes) in photon, proton and carbon ion therapy for pancreatic cancer patients. In this retrospective planning study, photon, proton and carbon ion treatment plans were created for 9 patients...
March 2, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28216520/examination-of-some-factors-affected-right-to-left-shunt-rate-and-the-normal-value-of-right-to-left-shunt-rate-in-lung-perfusion-scintigraphy
#15
Fumitoshi Nakamura, Masafumi Okabe, Takaaki Ono, Yousuke Sugimura, Naoko Muromoto, Ryou Suzuki, Taketoshi Okawada
PURPOSE: Diagnosis for right-to-left shunt was determined by the assessment of shunt-rate, which was obtained by using (99 m)Tc-macroaggregated albumin. However, it is difficult to diagnose right-to-left shunt, using the normal level of shunt-rate measured by using conventional methods. To solve this problem, we investigated ourselves the normal level of shunt-rate. METHOD: We researched 20 patients with pulmonary embolism, and they didn't have right-to-left shunt...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28207065/should-a-preoperative-testicular-exam-be-mandatory-for-abdominal-body-contouring-patients
#16
LETTER
Claire Fenoll, Samer Jabbour, Franck M Leclère, Rachel Pessis, Chakib Lkah, Michael Atlan
No abstract text is available yet for this article.
March 1, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28200103/rates-and-predictors-of-readmission-following-body-contouring-procedures-an-analysis-of-5100-patients-from-the-national-surgical-quality-improvement-program-database
#17
Brittany L Vieira, Robert Dorfman, Sergey Turin, Karol A Gutowski
No abstract text is available yet for this article.
February 14, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28195894/breast-reconstruction-using-pedicled-latissimus-dorsi-myocutaneous-flaps-in-asian-patients-with-small-breasts
#18
I-Han Chiang, Chih-Hsin Wang, Yuan-Sheng Tzeng, Hao-Yu Chiao, Chang-Yi Chou, Chi-Yu Wang, Tim-Mo Chen, Shyi-Gen Chen
BACKGROUND: The use of implants is still the most common procedure for breast reconstruction because they are easy, less painful than tissue transplants, and do not need a donor site. However, it is challenging to find a suitable implant for patients with small breasts, and some women fear foreign bodies and possible complications or reoperations. Autologous breast reconstruction using the pedicled latissimus dorsi (LD) myocutaneous flap without an implant provides a good option for Asian women with small breasts...
March 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28190601/clinical-implementation-of-coverage-probability-planning-for-nodal-boosting-in-locally-advanced-cervical-cancer
#19
Anne Ramlov, Marianne S Assenholt, Maria F Jensen, Caroline Grønborg, Remi Nout, Markus Alber, Lars Fokdal, Kari Tanderup, Jacob Chr Lindegaard
PURPOSE: To implement coverage probability (CovP) for dose planning of simultaneous integrated boost (SIB) of pathologic lymph nodes in locally advanced cervical cancer (LACC). MATERIAL AND METHODS: CovP constraints for SIB of the pathological nodal target (PTV-N) with a central dose peak and a relaxed coverage at the perimeter were generated for use with the treatment planning system Eclipse: PTV-N D98 >90%, CTV-N D98 >100% and CTV-N D50 >101.5% of prescribed dose...
February 9, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28179749/danish-translation-and-linguistic-validation-of-the-body-q-a-description-of-the-process
#20
Lotte Poulsen, Michael Rose, Anne Klassen, Kirsten K Roessler, Jens Ahm Sørensen
BACKGROUND: Patient-reported outcome (PRO) instruments are increasingly being included in research and clinical practice to assess the patient point of view. Bariatric and body contouring surgery has the potential to improve or restore a patient's body image and health-related quality of life (HR-QOL). A new PRO instrument, called the BODY-Q, has recently been developed specifically for this patient group. The aim of the current study was to translate and perform a linguistic validation of the BODY-Q for use in Danish bariatric and body contouring patients...
2017: European Journal of Plastic Surgery
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