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Inverse Planning

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https://www.readbyqxmd.com/read/28650965/epigenetic-adaptation-of-the-placental-serotonin-transporter-gene-slc6a4-to-gestational-diabetes-mellitus
#1
Sofia Blazevic, Marina Horvaticek, Maja Kesic, Peter Zill, Dubravka Hranilovic, Marina Ivanisevic, Gernot Desoye, Jasminka Stefulj
We tested the hypothesis that gestational diabetes mellitus (GDM) alters the DNA methylation pattern of the fetal serotonin transporter gene (SLC6A4), and examined the functional relevance of DNA methylation for regulation of the SLC6A4 expression in the human placenta. The study included 50 mother-infant pairs. Eighteen mothers were diagnosed with GDM and 32 had normal glucose tolerance (NGT). All neonates were of normal birth weight and born at term by planned Cesarean section. DNA and RNA were isolated from samples of tissue collected from the fetal side of the placenta immediately after delivery...
2017: PloS One
https://www.readbyqxmd.com/read/28633637/seroma-change-during-magnetic-resonance-imaging-guided-partial-breast-irradiation-and-its-clinical-implications
#2
Seung Hyuck Jeon, Kyung Hwan Shin, So-Yeon Park, Jung-In Kim, Jong Min Park, Jin Ho Kim, Eui Kyu Chie, Hong-Gyun Wu
BACKGROUND: To investigate the patterns of post-lumpectomy seroma volume (SV) change and related clinical factors to determine the benefits of adaptive planning in magnetic resonance imaging (MRI)-guided partial breast irradiation (PBI). METHODS: MRI data obtained from 37 women with early breast cancer acquired at simulation and at the 1st, 6th, and 10th fractions were analyzed. The planning target volume (PTV) was defined as unequal margins of 10-15 mm added according to the directional surgical margin status of each seroma...
June 20, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28626978/a-fast-multi-target-inverse-treatment-planning-strategy-optimizing-dosimetric-measures-for-high-dose-rate-hdr-brachytherapy
#3
Christian V Guthier, Antonio L Damato, Akila N Viswanathan, Juergen W Hesser, Robert A Cormack
PURPOSE: In this study, we introduce a novel, fast, inverse treatment planning strategy for interstitial high-dose-rate (HDR) brachytherapy with multiple regions of interest solely based on dose-volume-histogram-related dosimetric measures (DMs). METHODS: We present a new problem formulation of the objective function that approximates the indicator variables of the standard DM optimization problem with a smooth logistic function. This problem is optimized by standard gradient-based methods...
June 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28616596/laparoscopic-endoscopic-cooperative-surgery-lecs-for-the-upper-gastrointestinal-tract
#4
REVIEW
Tatsuo Matsuda, Souya Nunobe, Manabu Ohashi, Naoki Hiki
We developed the laparoscopic and endoscopic cooperative surgery (LECS) technique, which combines endoscopic submucosal dissection (ESD) and laparoscopic gastric resection to resect gastric submucosal tumors (SMTs). Many researchers have reported LECS to be a feasible technique for gastric submucosal tumor resection regardless of tumor location, including the esophagogastric junction (EGJ). Recently, the Japanese National Health Insurance system approved LECS for insurance coverage, and it is now widely applied for gastric submucosal tumor resection...
2017: Translational Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28614431/factors-associated-with-the-risk-of-fall-in-adults-in-the-postoperative-period-a-cross-sectional-study
#5
Luciana Regina Ferreira da Mata, Cissa Azevedo, Aryanne Gabrielle Policarpo, Juliano Teixeira Moraes
Objective: to assess the factors associated with the risk of fall in patients undergoing surgical procedures. Method: quantitative and cross-sectional study carried out with 257 adult patients in a hospital in the state of Minas Gerais, Brazil. Data were collected using the sociodemographic and clinical questionnaire, the Morse Fall Scale, and the Quality of Recovery Score. Data were submitted to descriptive statistical analysis and multinomial logistic regression...
June 8, 2017: Revista Latino-americana de Enfermagem
https://www.readbyqxmd.com/read/28614004/anthropometric-features-are-not-predictive-of-72-hour-fast-duration-in-insulinomas
#6
Diane Donegan, Iva Jakubikova, Adrian Vella
BACKGROUND: The 72 hour fast is used to document Whipple's triad and understand the mechanism of hypoglycemia. Although hypoglycaemia develops within 24 hours in the majority of fasts, identifying possible determinants of fast duration may help to predict the need for admission. Therefore we determined the relation between anthropometric features on fast duration and assessed end of fast parameters on maximal tumor size, extent of disease or tumor recurrence. METHODS: A retrospective analysis of patients with insulinoma in the past 25 years who underwent a 72 hour fast conducted...
June 14, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28598900/interleaved-mapping-of-temperature-and-longitudinal-relaxation-rate-to-monitor-drug-delivery-during-magnetic-resonance-guided-high-intensity-focused-ultrasound-induced-hyperthermia
#7
Esther Kneepkens, Edwin Heijman, Jochen Keupp, Steffen Weiss, Klaas Nicolay, Holger Grüll
OBJECTIVES: Magnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) is a method to heat lesions noninvasively to a stable, elevated temperature and a well-suited method to induce local hyperthermia (41°C-43°C) in deep-seated tissues. Magnetic Resonance (MR) imaging provides therapy planning on anatomical images and offers temperature feedback based on near-real-time MR thermometry. Although constant acquisition of MR thermometry data is crucial to ensure prolonged hyperthermia, it limits the freedom to perform measurements of other MR parameters, which are of interest during hyperthermia treatments...
June 8, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28578699/treating-lung-cancer-with-dynamic-conformal-arc-therapy-a-dosimetric-study
#8
Primož Peterlin, Karmen Stanič, Ignasi Méndez, Andrej Strojnik
BACKGROUND: Lung cancer patients are often in poor physical condition, and a shorter treatment time would reduce their discomfort. Dynamic conformal arc therapy (DCAT) offers a shorter treatment time than conventional 3D conformal radiotherapy (3D CRT) and is usually available even in departments without inverse planning possibilities. We examined its suitability as a treatment modality for lung cancer patients. METHODS: On a cohort of 35 lung cancer patients, relevant dosimetric parameters were compared in respective DCAT and 3D CRT treatment plans...
June 2, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28571409/a-manipulative-instrument-with-simultaneous-gesture-and-end-effector-trajectory-planning-and-controlling
#9
Hsien-I Lin, Xuan-Anh Nguyen
To operate a redundant manipulator to accomplish the end-effector trajectory planning and simultaneously control its gesture in online programming, incorporating the human motion is a useful and flexible option. This paper focuses on a manipulative instrument that can simultaneously control its arm gesture and end-effector trajectory via human teleoperation. The instrument can be classified by two parts; first, for the human motion capture and data processing, marker systems are proposed to capture human gesture...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28570956/worry-and-risk-perception-of-breast-cancer-in-a-prevention-trial-of-low-dose-tamoxifen-in-midlife-postmenopausal-hormone-users
#10
Gabriella Rondanina, Matteo Puntoni, Aliana Guerrieri-Gonzaga, Domenico Marra, Bernardo Bonanni, Andrea DeCensi
OBJECTIVE: There is increasing interest in combining postmenopausal hormone therapy (HT) and SERMs in midlife women. We previously showed that refusal to participate in a prevention trial of low dose tamoxifen in HT users was associated with higher worry about breast cancer. Given this counterintuitive finding, we studied which factors influenced worry and risk perception of breast cancer. METHODS: We assessed the relationships of breast cancer worry and risk perception with age, age at menopause, Gail risk, education, adherence to mammographic screening, BMI, smoking, physical activity, alcohol use, anxiety and depression in 457 midlife HT users who were eligible to participate in the trial...
May 29, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28570755/personal-and-hospital-factors-associated-with-limited-surgical-resection-for-lung-cancer-in-hospital-mortality-and-complications-in-new-york-state
#11
Emanuela Taioli, Bian Liu, Daniel G Nicastri, Wil Lieberman-Cribbin, Emanuele Leoncini, Raja M Flores
BACKGROUND AND OBJECTIVES: Early stage lung cancer is generally treated with surgical resection. The objective of the study was to identify patient and hospital characteristics associated with the type of lung cancer surgical approach utilized in New York State (NYS), and to assess in-hospital adverse events. METHODS: A total of 33 960 lung cancer patients who underwent limited resection (LR) or lobectomy (L) were selected from the NYS Statewide Planning and Research Cooperative System database (1995-2012)...
June 1, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28569531/social-cognitive-factors-of-long-term-physical-exercise-7-years-after-orthopedic-treatment
#12
Juliane Paech, Sonia Lippke
OBJECTIVE: Although it has been confirmed that physical exercise improves orthopedic conditions, many individuals fail to maintain a regular exercise regimen after being discharged from medical rehabilitation. The present study examines the role of intention, social support, self-determination, planning, and self-efficacy in facilitating strength and endurance training. DESIGN: In a 7-year observational study, intention, received social support and self-determination were assessed at baseline, self-efficacy and planning at 6-month follow-up, and physical exercise at 1-year, 3-year, and 7-year follow-up...
May 2017: Rehabilitation Psychology
https://www.readbyqxmd.com/read/28555481/haemodialysis-services-in-the-northeastern-region-of-iran
#13
Behzad Kiani, Nasser Bagheri, Ahmad Tara, Benyamin Hoseini, Mahmoud Tara
Chronic kidney disease is growing and the current estimated global prevalence exceeds 13%. As the use of haemodialysis machines for patients with end stage renal disease increases survival considerably, it is critical to plan correctly for the allocation of these machines. This study aimed to develop a geographical information systems (GIS)-based approach to predict the need for this service in the northeastern region of Iran taking into account where patients live and where haemodialysis is the most needed and identifying areas with poor access to haemodialysis centres...
May 11, 2017: Geospatial Health
https://www.readbyqxmd.com/read/28553583/assessment-and-comparison-of-homogeneity-and-conformity-indexes-in-step-and-shoot-and-compensator-based-intensity-modulated-radiation-therapy-imrt-and-three-dimensional-conformal-radiation-therapy-3d-crt-in-prostate-cancer
#14
Marzieh Salimi, Kaveh Shirani Tak Abi, Hassan Ali Nedaie, Hossein Hassani, Hussain Gharaati, Mahmood Samei, Rezgar Shahi, Hamed Zarei
Intensity modulated radiation therapy (IMRT) and three-dimensional conformal radiation therapy (3D CRT) are two treatment modalities in prostate cancer, which provide acceptable dose distribution in tumor region with sparing the surrounding normal tissues. IMRT is based on inverse planning optimization; in which, intensity of beams is modified by using multileaf collimators and also compensators with optimum shapes in step and shoot (SAS) and compensator-based method, respectively. In the recent study, some important parameters were compared in two IMRT and 3D CRT methods...
April 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28545231/atmospheric-sampling-on-ascension-island-using-multirotor-uavs
#15
Colin Greatwood, Thomas S Richardson, Jim Freer, Rick M Thomas, A Rob MacKenzie, Rebecca Brownlow, David Lowry, Rebecca E Fisher, Euan G Nisbet
As part of an NERC-funded project investigating the southern methane anomaly, a team drawn from the Universities of Bristol, Birmingham and Royal Holloway flew small unmanned multirotors from Ascension Island for the purposes of atmospheric sampling. The objective of these flights was to collect air samples from below, within and above a persistent atmospheric feature, the Trade Wind Inversion, in order to characterise methane concentrations and their isotopic composition. These parameters allow the methane in the different air masses to be tied to different source locations, which can be further analysed using back trajectory atmospheric computer modelling...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28541236/attention-deficit-hyperactivity-disorder-adhd-symptoms-and-cognitive-skills-of-preschool-children
#16
L Thomaidis, A Choleva, M Janikian, G Bertou, A Tsitsika, G Giannakopoulos, D C Anagnostopoulos
Attention deficit/hyperactivity disorder (ADHD) constitutes a neurobehavioral disorder which may potentially adversely affect children's wellbeing and academic achievement. The onset of symptoms is present prior to 12 years of age, and often the symptoms are evident in the preschool years. In fact, it has been suggested that screening for ADHD symptoms may be initiated as early as four years of age. Preschool children with ADHD have been shown to present with poor pre-academic skills and might be at increased risk for numerous school-related problems, including functional impairment during elementary school years and persistent poor academic performance thereafter...
January 2017: Psychiatrikē, Psychiatriki
https://www.readbyqxmd.com/read/28540820/theoretical-model-for-laser-ablation-outcome-predictions-in-brain-calibration-and-validation-on-clinical-mr-thermometry-images
#17
Samuel John Fahrenholtz, Reza Madankan, Shabbar Danish, John D Hazle, R Jason Stafford, David Fuentes
PURPOSE: Neurosurgical laser ablation is experiencing a renaissance. Computational tools for ablation planning aim to further improve the intervention. Here, global optimisation and inverse problems are demonstrated to train a model that predicts maximum laser ablation extent. METHODS: A closed-form steady state model is trained on and then subsequently compared to N = 20 retrospective clinical MR thermometry datasets. Dice similarity coefficient (DSC) is calculated to provide a measure of region overlap between the 57 °C isotherms of the thermometry data and the model-predicted ablation regions; 57 °C is a tissue death surrogate at thermal steady state...
May 19, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28533954/exercise-and-dietary-program-induced-weight-reduction-is-associated-with-cognitive-function-among-obese-adolescents-a-longitudinal-study
#18
Chun Xie, Xiaochun Wang, Chenglin Zhou, Chang Xu, Yu-Kai Chang
OBJECTIVE: The present study was to determine the effect of a combined exercise and dietary program on cognitive function as well as the relationship between the program-induced weight change and cognitive function alterations. DESIGN: The study applies a quasi-experimental design. METHODS: Fifty-eight adolescents with obese status (body mass index, BMI >28 kg/m(2)) were assigned to either an experiment (n = 30) or control group (n = 28)...
2017: PeerJ
https://www.readbyqxmd.com/read/28522658/effect-of-fontan-geometry-on-exercise-haemodynamics-and-its-potential-implications
#19
Elaine Tang, Zhenglun Alan Wei, Kevin K Whitehead, Reza H Khiabani, Maria Restrepo, Lucia Mirabella, James Bethel, Stephen M Paridon, Bradley S Marino, Mark A Fogel, Ajit P Yoganathan
OBJECTIVE: Exercise intolerance afflicts Fontan patients with total cavopulmonary connections (TCPCs) causing a reduction in quality of life. Optimising TCPC design is hypothesised to have a beneficial effect on exercise capacity. This study investigates relationships between TCPC geometries and exercise haemodynamics and performance. METHODS: This study included 47 patients who completed metabolic exercise stress test with cardiac magnetic resonance (CMR). Phase-contrast CMR images were acquired immediately following supine lower limb exercise...
May 18, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28521759/dosimetric-comparison-of-interstitial-brachytherapy-with-multi-channel-vaginal-cylinder-plans-in-patients-with-vaginal-tumors
#20
Lucas C Mendez, Moti Paudel, Matt Wronski, Ananth Ravi, Lisa Barbera, Eric Leung
BACKGROUND: To evaluate the dosimetric performance of multi-channel vaginal cylinder (MCVC) against interstitial brachytherapy (ISBT) for the treatment of vaginal tumors. METHODS: Vaginal tumors with extension of > 0.5 cm and ≤ 2 cm from the lateral vaginal wall and/or ≤ 1 cm in height above the vaginal vault were retrospectively selected from a ISBT registry trial database. The selected patients were treated with ISBT and targets included the intermediate (IRCTV) or high-risk (HRCTV) clinical target volumes...
May 18, 2017: Radiation Oncology
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