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https://www.readbyqxmd.com/read/29131812/an-improved-distance-to-dose-correlation-for-predicting-bladder-and-rectum-dose-volumes-in-knowledge-based-vmat-planning-for-prostate-cancer
#1
Phillip D H Wall, Robert L Carver, Jonas D Fontenot
The overlap volume histogram (OVH) is an anatomical metric commonly used to quantify the geometric relationship between an organ at risk (OAR) and target volume when predicting expected dose-volumes in knowledge-based planning (KBP). This work investigated the influence of additional variables contributing to variations in the assumed linear DVH-OVH correlation for the bladder and rectum in VMAT plans of prostate patients, with the goal of increasing prediction accuracy and achievability of knowledge-based planning methods...
November 13, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29102747/endoscopic-versus-open-great-saphenous-vein-harvesting-for-femoral-to-popliteal-artery-bypass
#2
Aleem K Mirza, Kendall Stauffer, Mark D Fleming, Randall De Martino, Gustavo Oderich, Manju Kalra, Peter Gloviczki, Thomas Bower
OBJECTIVE: Conflicting data exist on outcomes of open vein harvest (OVH) and endoscopic vein harvest (EVH) for infrainguinal bypass. The purpose of this study was to compare outcomes between OVH and EVH in femoral to popliteal artery bypasses. METHODS: A retrospective review was performed of all patients undergoing common femoral to popliteal artery bypass with great saphenous vein between January 1997 and June 2014. Bypasses using arm or composite vein were excluded, as were those performed for popliteal artery aneurysms or trauma...
November 1, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29051309/clinical-prevalence-and-associated-intraoperative-surgical-complications-of-reproductive-tract-lesions-in-pot-bellied-pigs-undergoing-ovariohysterectomy-298-cases-2006-2016
#3
Elizabeth Cypher, Ricardo Videla, Rebecca Pierce, Robert T Snowden, Jennifer Ann Sexton, Sarel van Amstel
To address the current dearth of clinically relevant publications regarding ovariohysterectomy (OVH) in the domestic pot-bellied pig (PBP), the present study aims to report prevalence of uterine lesions, intraoperative complications, and short and long-term survival in this species (n=298). Prevalence of lesions included uterine neoplasia 11.4 per cent (34/298), pyometra 1.6 per cent (5/298) and cystic endometrial hyperplasia 5 per cent (15/298). Pigs at least six years of age were statistically more likely to have a uterine lesion (less than P=0...
October 19, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28767202/effects-of-parenteral-fish-oil-on-plasma-nonesterified-fatty-acids-and-systemic-inflammatory-mediators-in-dogs-following-ovariohysterectomy
#4
Kaoru Tsuruta, Robert C Backus, Amy E DeClue, Kevin L Fritsche, Fred A Mann
OBJECTIVE: To evaluate the effects of intravenous (IV) infusion of fish oil (FO) emulsion following ovariohysterectomy (OVH) on inflammatory mediators and plasma omega-3 nonesterified fatty acids (NEFA) concentrations in dogs. DESIGN: Prospective clinical study. SETTING: University teaching hospital. ANIMALS: Twenty-nine privately owned dogs undergoing routine OVH. INTERVENTIONS: Postoperative 3-hour IV infusion of saline (n = 9), FO (Omegaven, n = 10), or soybean oil (SO, intralipid, n = 10) emulsion and blood collected before, 5 and 24 hours following OVH for plasma NEFA and RBC membrane fatty acids (FAs) concentrations, leukocyte cytokine production capacity, and C-reactive protein (CRP) measurement...
September 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28637880/study-comparing-vein-integrity-and-clinical-outcomes-in-open-vein-harvesting-and-2-types-of-endoscopic-vein-harvesting-for-coronary-artery-bypass-grafting-the-vico-randomized-clinical-trial-vein-integrity-and-clinical-outcomes
#5
RANDOMIZED CONTROLLED TRIAL
Bhuvaneswari Krishnamoorthy, William R Critchley, Alexander J Thompson, Katherine Payne, Julie Morris, Rajamiyer V Venkateswaran, Ann L Caress, James E Fildes, Nizar Yonan
BACKGROUND: Current consensus statements maintain that endoscopic vein harvesting (EVH) should be standard care in coronary artery bypass graft surgery, but vein quality and clinical outcomes have been questioned. The VICO trial (Vein Integrity and Clinical Outcomes) was designed to assess the impact of different vein harvesting methods on vessel damage and whether this contributes to clinical outcomes after coronary artery bypass grafting. METHODS: In this single-center, randomized clinical trial, patients undergoing coronary artery bypass grafting with an internal mammary artery and with 1 to 4 vein grafts were recruited...
October 31, 2017: Circulation
https://www.readbyqxmd.com/read/28619884/effect-of-an-obesogenic-diet-on-circadian-activity-and-serum-hormones-in-old-monkeys
#6
Henryk F Urbanski, Kevin Mueller, Cynthia L Bethea
Like women, old female rhesus macaques undergo menopause and show many of the same age-associated changes, including perturbed activity/rest cycles and altered circulating levels of many hormones. Previous studies showed that administration of an estrogen agonist increased activity in female monkeys, that hormone therapy (HT) increased activity in postmenopausal women and that obesity decreased activity in women. The present study sought to determine if postmenopausal activity and circulating hormone levels also respond to HT when monkeys are fed a high-fat, high-sugar Western style diet (WSD)...
August 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28538805/the-effect-of-epidurally-administered-dexamethasone-with-lignocaine-for-post-operative-analgesia-in-dogs-undergoing-ovariohysterectomy-a-dose-response-study
#7
RANDOMIZED CONTROLLED TRIAL
Larissa Correa Hermeto, Rafael de Rossi, Natalia de Andrade Bicudo, Klebs Tavares Assis, Lucas Latta Escobar, Pedro Santana de Camargo
Purpose: To evaluate the postoperative analgesic and adverse effects of three doses of dexamethasone, administered epidurally in combination with lignocaine, in dogs undergoing ovariohysterectomy (OVH). Methods: Twenty-four female dogs undergoing ovariohysterectomy were pre-medicated with acepromazine and general anaesthesia was induced and maintained with propofol. Animals were randomly allocated into four groups of six. The control group was given lignocaine 2% (LI) and the treatment groups were given lignocaine with either 2 mg dexamethasone (LIDEX2), 4 mg dexamethasone (LIDEX4) or 8 mg dexamethasone (LIDEX8) administered at the lumbosacral epidural space...
April 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28438215/predicting-liver-sbrt-eligibility-and-plan-quality-for-vmat-and-4%C3%AF-plans
#8
Angelia Tran, Kaley Woods, Dan Nguyen, Victoria Y Yu, Tianye Niu, Minsong Cao, Percy Lee, Ke Sheng
BACKGROUND: It is useful to predict planned dosimetry and determine the eligibility of a liver cancer patient for SBRT treatment using knowledge based planning (KBP). We compare the predictive accuracy using the overlap volume histogram (OVH) and statistical voxel dose learning (SVDL) KBP prediction models for coplanar VMAT to non-coplanar 4π radiotherapy plans. METHODS: In this study, 21 liver SBRT cases were selected, which were initially treated using coplanar VMAT plans...
April 24, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28351570/topical-agents-for-oral-cancer-chemoprevention-a-systematic-review-of-the-literature
#9
REVIEW
Lucy Chau, Justin T Jabara, Wanda Lai, Peter F Svider, Blake M Warner, Ho-Sheng Lin, S Naweed Raza, Andrew M Fribley
OBJECTIVES/HYPOTHESIS: We review the use of topical chemoprevention agents in patients with oral potentially malignant disorders (PMD). METHODS: A systematic review of studies on topical chemoprevention agents for oral PMD from 1946 to November 2016 was conducted using the MEDLINE database, Embase, and Cochrane Library. Data were extracted and analyzed from selected studies including study type, sample size, demographics, treatment length, response rate, follow-up time, adverse effects, and recurrence...
April 2017: Oral Oncology
https://www.readbyqxmd.com/read/28202228/cross-institutional-knowledge-based-planning-kbp-implementation-and-its-performance-comparison-to-auto-planning-engine-ape
#10
MULTICENTER STUDY
Binbin Wu, Martijn Kusters, Martina Kunze-Busch, Tim Dijkema, Todd McNutt, Giuseppe Sanguineti, Karl Bzdusek, Anatoly Dritschilo, Dalong Pang
BACKGROUND AND PURPOSE: To investigate (1) whether a plan library established at one institution can be applied for another institution's knowledge-based planning (KBP); (2) the performance of cross-institutional KBP compared to Auto-Planning Engine (APE). MATERIAL AND METHODS: Radboud University Medical Center (RUMC) provided 35 oropharyngeal cancer patients (68Gy to PTV(68) and 50.3Gy to PTV(50.3)) with clinically-delivered and comparative APE plans. The Johns Hopkins University (JHU) contributed a three-dose-level plan library consisting of 179 clinically-delivered plans...
April 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28048258/su-f-r-47-quantitative-shape-relationship-analysis-of-ptv-modification-for-critical-anatomy-sparing-and-its-impact-on-pathologic-response-for-neoadjuvant-stereotactic-radiotherapy-for-pancreatic-cancer
#11
Z Cheng, L Rosati, L Chen, S Robertson, J Moore, L Peng, O Mian, A Narang, A Hacker-Prietz, J Herman, T McNutt
PURPOSE: Stereotactic body radiation therapy (SBRT) may be used to increase surgery candidacy in borderline resectable (BRPC) and locally advanced (LAPC) pancreatic cancer. However, the planning target volume (PTV) may need to be limited to avoid toxicity when the gross tumor volume (GTV) is anatomically involved with surrounding critical structures. Our study aims to characterize the coverage of GTV and investigate the association between modified PTV and pathologic (pCR) or near pathologic (npCR) complete response rates determined from the surgical specimen...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047675/th-cd-202-08-feasibility-study-of-planning-phase-optimization-using-patient-geometry-driven-information-for-better-dose-sparing-of-organ-at-risks
#12
S Kang, S Kim, D Kim, T Kim, S Park, D Shin, K Kim, M Cho, T Suh
PURPOSE: To propose a simple and effective cost value function to search optimal planning phase (gating window) and demonstrated its feasibility for respiratory correlated radiation therapy. METHODS: We acquired 4DCT of 10 phases for 10 lung patients who have tumor located near OARs such as esophagus, heart, and spinal cord (i.e., central lung cancer patients). A simplified mathematical optimization function was established by using overlap volume histogram (OVH) between the target and organ at risk (OAR) at each phase and the tolerance dose of selected OARs to achieve surrounding OARs dose-sparing...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046846/su-f-p-35-a-multi-institutional-plan-quality-checking-tool-built-on-oncospace-a-shared-radiation-oncology-database-system
#13
M Bowers, S Robertson, J Moore, J Wong, M Phillips, K Hendrickson, K Evans, T McNutt
PURPOSE: Late toxicity from radiation to critical structures limits the possible dose in Radiation Therapy. Perfectly conformal treatment of a target is not realizable, so the clinician must accept a certain level of collateral radiation to nearby OARs. But how much? General guidelines exist for healthy tissue sparing which guide RT treatment planning, but are these guidelines good enough to create the optimal plan given the individualized patient anatomy? We propose a means to evaluate the planned dose level to an OAR using a multi-institutional data-store of previously treated patients, so a clinician might reconsider planning objectives...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046761/mo-g-201-01-a-multi-institutional-study-investigating-the-performance-of-a-knowledge-based-planning-system-against-pinnacle-auto-planning-engine-in-sib-imrt-for-the-head-and-neck-cancer
#14
B Wu, M Kusters, M Kunze-Busch, T Dijkema, T McNutt, G Sanguineti, D Pang
PURPOSE: Knowledge-based Planning (KBP) founded on prior planning experience and Auto-Planning Engine (APE; commercialized in Pinnacle v9.10 TPS) based on progressive optimization algorithm both aim to eliminate the trial-and-error process in radiotherapy inverse planning. This study investigates the performance of the approaches in a multi-institutional setting to evaluate their functionalities in oropharyngeal cancer and offers suggestions how they can be implemented in the clinic. METHODS: Radboud University Medical Center (RUMC) provided 35 oropharyngeal cancer patients (SIB-IMRT with two-dose-level prescription: 68 Gy to PTV68 and 50...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046285/su-g-tep1-09-modality-specific-dose-gradient-modeling-for-prostate-imrt-using-spherical-distance-maps-of-ptv-and-isodose-contours
#15
M M Folkerts, X Gu, W Lu, R J Radke, S B Jiang
PURPOSE: Overlapping volume histogram (OVH) and distance-to-target histogram (DTH) calculations rely on the assumption that dose gradients are symmetric with respect to primary target volume (PTV) expansion and minimum distance to PTV surface, respectively. It is desirable to lift this assumption and instead account for achievable modality-specific dose gradients (MSDG) for a given PTV shape. METHODS: From a library of 96 prostate 7-beam IMRT plans, we computed spherical distance maps (SDMs) for PTVs and 3 iso-dose contours...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27865210/exophytic-verrucous-hyperplasia-of-the-oral-cavity-%C3%A2-application-of-standardized-criteria-for-diagnosis-from-a-consensus-report
#16
Binti Zain Rosnah, George Kallarakkal Thomas, Ramanathan Anand, Kim Jin, Tilakaratne Wm, Takata Takashi, Warnakulasuriya Saman, Kumar Hazarey Vinay, Rich Alison, Mohd Hussaini Haizal, Jalil Ajura
Verruco-papillary lesions (VPLs) of the oral cavity described in the literature involve a spectrum of conditions including squamous papilloma, verruca vulgaris, focal epithelial hyperplasia, condyloma, proliferative verrucous leukoplakia and verrucous carcinoma. A majority of the VPLs are slow growing, benign in nature and have a viral aetiology. Virus associated benign mucosal outgrowths are not too difficult to diagnose either clinically or by microscopy. Apart from virus-associated lesions, VPLs harboring malignant potential or behaviour such as verrucous carcinoma, proliferative verrucous leukoplakia, oral verrucous hyperplasia (OVH), oral papillary squamous cell carcinoma (PSCC) and oral conventional squamous cell carcinoma with papillary features (CSCC) need to be further clarified for better understanding of their predictable biologic behavior and appropriate treatment...
January 9, 2016: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/27769290/ipc-isoelectric-point-calculator
#17
Lukasz P Kozlowski
BACKGROUND: Accurate estimation of the isoelectric point (pI) based on the amino acid sequence is useful for many analytical biochemistry and proteomics techniques such as 2-D polyacrylamide gel electrophoresis, or capillary isoelectric focusing used in combination with high-throughput mass spectrometry. Additionally, pI estimation can be helpful during protein crystallization trials. RESULTS: Here, I present the Isoelectric Point Calculator (IPC), a web service and a standalone program for the accurate estimation of protein and peptide pI using different sets of dissociation constant (pKa) values, including two new computationally optimized pKa sets...
October 21, 2016: Biology Direct
https://www.readbyqxmd.com/read/27743690/gnrh-agonist-implants-suppress-reproductive-function-and-affects-ovarian-lhr-and-fshr-expression-in-prepubertal-female-cats
#18
N S Mehl, S Srisuwatanasagul, T Swangchan-Uthai, S Sirivaidyapong, M Khalid
Effect of a GnRH-agonist (deslorelin) was studied on reproductive function and ovarian luteinizing hormone receptor (LHR) and follicle stimulating hormone receptor (FSHR) expression in prepubertal female cats that were either implanted with 4.7-mg deslorelin (implanted: n = 6) or not (controls: n = 18) or ovariohysterectomized at prepubertal age (prepubertal OVH: n = 6). Body weights, fecal estradiol, and sexual behavior of implanted and control cats were monitored for 48 weeks followed by collection of ovaries and uteri...
January 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/27721598/oral-verrucous-hyperplasia-versus-oral-verrucous-carcinoma-a-clinicopathologic-dilemma-revisited-using-p53-as-immunohistochemical-marker
#19
Preeti Sharma, Vijay Wadhwan, Pooja Aggarwal, Anamika Sharma
BACKGROUND: Oral verrucous hyperplasia (OVH) and oral verrucous carcinoma (OVC) are two distinct clinicopathologic verrucous lesions. However, the distinction between the two lesions still remains enigmatic. It is almost impossible to distinguish them clinically. Thus, the final diagnosis rests on the histopathological characteristics of both lesions, being distinguished from each other by an exophytic and endophytic growth pattern, respectively. METHODS: This institutional study was planned to review retrospectively two series of patients with histologic diagnoses of VH (n = 27) and VC (n = 27) to investigate their clinicopathological features and to analyze the role of immunohistochemical (IHC) marker p53 protein in distinguishing between the two verrucous lesions...
September 2016: Journal of Oral and Maxillofacial Pathology: JOMFP
https://www.readbyqxmd.com/read/27623696/an-effective-calculation-method-for-an-overlap-volume-histogram-descriptor-and-its-application-in-imrt-plan-retrieval
#20
Zhengdong Zhou, Wenwen Zhang, Shaolin Guan
To effectively calculate an overlap volume histogram (OVH) descriptor and improve intensity modulated radiation treatment (IMRT) planning by basing it on previous plans with similar features, a method based on morphology for OVH calculation was proposed and a novel similarity measurement was employed for retrieval of a suitable IMRT plan. First, the minimum and maximum distances between the tumor and organs at risk (OARs) were calculated as the start and end points for contraction or expansion, and a suitable step size for contraction or expansion was determined according to these distances...
October 2016: Physica Medica: PM
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