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https://www.readbyqxmd.com/read/28087299/when-partial-nephrectomy-is-unsuccessful-understanding-the-reasons-for-conversion-from-robotic-partial-to-radical-nephrectomy-at-a-tertiary-referral-center
#1
Önder Kara, Matthew J Maurice, Pascal Mouracade, Ercan Malkoç, Julien Dagenais, Ryan J Nelson, Jaya Sai Chavali, Robert J Stein, Amr Fergany, Jihad H Kaouk
OBJECTIVE: To identify the preoperative factors associated with conversion from robotic partial nephrectomy (RPN) to radical nephrectomy (RN), and to report the incidence of this event. PATIENTS AND METHODS: Using our institutional review board-approved database, we abstracted data on 1023 RPN cases performed at our center between 2010 and 2015. Standard and converted cases were compared in terms of patients and tumor characteristics and perioperative, functional, and oncological outcomes...
January 10, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28079702/radiomic-analysis-reveals-prognostic-information-in-t1-weighted-baseline-magnetic-resonance-imaging-in-patients-with-glioblastoma
#2
Michael Ingrisch, Moritz Jörg Schneider, Dominik Nörenberg, Giovanna Negrao de Figueiredo, Klaus Maier-Hein, Bogdana Suchorska, Ulrich Schüller, Nathalie Albert, Hartmut Brückmann, Maximilian Reiser, Jörg-Christian Tonn, Birgit Ertl-Wagner
OBJECTIVES: The aim of this study was to investigate whether radiomic analysis with random survival forests (RSFs) can predict overall survival from T1-weighted contrast-enhanced baseline magnetic resonance imaging (MRI) scans in a cohort of glioblastoma multiforme (GBM) patients with uniform treatment. MATERIALS AND METHODS: This retrospective study was approved by the institutional review board and informed consent was waived. The MRI scans from 66 patients with newly diagnosed GBM from a previous prospective study were analyzed...
January 9, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28079698/pediatric-hand-surgery-in-global-health-the-role-for-international-outreach
#3
Karen Y Chung, Amanda Hanemaayer, Dan Poenaru
PURPOSE: There is emerging interest in hand surgery and global health. This was emphasized at the 2015 presidential address at the American Society for Surgery of Hand. Children are prioritized because of their increased risk for trauma and higher potential for better outcomes. This study aims to identify how hand surgical volunteer programs can benefit the pediatric hand surgical landscape in global health. There has been no literature review to date. METHODS: This institutional review board-approved review systematically searched PubMed, Embase, Medline, African Journal Online, and the Journal of Hand Surgery...
February 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28079398/feasibility-evaluation-of-diffusion-weighted-imaging-using-an-integrated-mri-radiotherapy-system-for-response-assessment-to-neoadjuvant-therapy-in-rectal-cancer
#4
Narek Shaverdian, Yingli Yang, Peng Hu, Steven Hart, Ke Sheng, James Lamb, Minsong Cao, Nzhde Agazaryan, David Thomas, Michael Steinberg, Daniel A Low, Percy Lee
OBJECTIVES: To evaluate the feasibility of on-board DWI with an integrated low-field MRI-radiotherapy system to assess responses to neoadjuvant chemoradiation (NAC) in rectal cancer. METHODS: A spin echo-based planar imaging diffusion sequence on a 0.35 T MRI-radiotherapy system was acquired over the course of NAC. The apparent diffusion coefficients (ADC) from the tumor region of interest (ROIs) were calculated. A functional diffusion map (fDM) was created showing a pixel-wise ADC analysis of the ROI over the course of treatment...
January 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28079267/estimating-4d-cbct-from-prior-information-and-extremely-limited-angle-projections-using-structural-pca-and-weighted-free-form-deformation-for-lung-radiotherapy
#5
Wendy Harris, You Zhang, Fang-Fang Yin, Lei Ren
PURPOSE: To investigate the feasibility of using structural-based principal component analysis (PCA) motion-modeling and weighted free-form deformation to estimate on-board 4D-CBCT using prior information and extremely limited angle projections for potential 4D target verification of lung radiotherapy. METHODS: A technique for lung 4D-CBCT reconstruction has been previously developed using a deformation field map (DFM)-based strategy. In the previous method, each phase of the 4D-CBCT was generated by deforming a prior CT volume...
January 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28076721/effect-of-tumor-complexity-and-technique-on-efficacy-and-complications-after-percutaneous-microwave-ablation-of-stage-t1a-renal-cell-carcinoma-a-single-center-retrospective-study
#6
Marki E Klapperich, E Jason Abel, Timothy J Ziemlewicz, Sara Best, Meghan G Lubner, Stephen Y Nakada, J Louis Hinshaw, Christopher L Brace, Fred T Lee, Shane A Wells
Purpose To evaluate the effects of tumor complexity and technique on early and midterm oncologic efficacy and rate of complications for 100 consecutive biopsy-proved stage T1a renal cell carcinomas (RCCs) treated with percutaneous microwave ablation. Materials and Methods This HIPAA-compliant, single-center retrospective study was approved by the institutional review board. The requirement to obtain informed consent was waived. Ninety-six consecutive patients (68 men, 28 women; mean age, 66 years ± 9.4) with 100 stage T1a N0M0 biopsy-proved RCCs (median diameter, 2...
January 11, 2017: Radiology
https://www.readbyqxmd.com/read/28058550/do-calcifications-seen-on-mammography-after-neoadjuvant-chemotherapy-for-breast-cancer-always-need-to-be-excised
#7
Yara Feliciano, Anita Mamtani, Monica Morrow, Michelle M Stempel, Sujata Patil, Maxine S Jochelson
BACKGROUND: This study aimed to determine the relationship between mammographic calcifications and magnetic resonance imaging (MRI) tumoral enhancement before and after neoadjuvant chemotherapy (NAC) and to assess the impact of these findings on surgical management. METHODS: This Institutional Review Board-approved, Health Insurance Portability and Accountability Act (HIPAA)-compliant retrospective study involved breast cancer patients who underwent NAC between 2009 and 2015...
January 5, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/28054731/lung-adenocarcinoma-assessment-of-epidermal-growth-factor-receptor-mutation-status-based-on-extended-models-of-diffusion-weighted-image
#8
Mei Yuan, Xue-Hui Pu, Xiao-Quan Xu, Yu-Dong Zhang, Yan Zhong, Hai Li, Jiang-Fen Wu, Tong-Fu Yu
PURPOSE: To evaluate the diagnostic performance of extended models of diffusion-weighted (DW) imaging to help differentiate the epidermal growth factor receptor (EGFR) mutation status in stage IIIA-IV lung adenocarcinoma. MATERIALS AND METHODS: This retrospective study had institutional research board approval and was HIPAA compliant. Preoperative extended DW imaging including intravoxel incoherent motion (IVIM) and diffusional kurtosis imaging (DKI) 3 Tesla MRI were retrospectively evaluated in 53 patients with pathologically confirmed non-early stage (IIIA-IV) lung adenocarcinoma...
January 5, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28048706/tu-ab-bra-06-best-in-physics-joint-imaging-therapy-an-mri-compatible-externally-and-internally-deformable-lung-motion-phantom-for-multi-modality-igrt
#9
P Sabouri, T Arai, A Sawant
PURPOSE: MRI has become an attractive tool for tumor motion management. Current MR-compatible phantoms are only capable of reproducing translational motion. This study describes the construction and validation of a more realistic, MRI-compatible lung phantom that is deformable internally as well as externally. We demonstrate a radiotherapy application of this phantom by validating the geometric accuracy of the open-source deformable image registration software NiftyReg (UCL, UK). METHODS: The outer shell of a commercially-available dynamic breathing torso phantom was filled with natural latex foam with eleven water tubes...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048449/we-d-204-04-learning-the-ropes-clinical-immersion-in-the-first-month-of-residency
#10
S Dieterich
: Speakers in this session will present overview and details of a specific rotation or feature of their Medical Physics Residency Program that is particularly exceptional and noteworthy. The featured rotations include foundational topics executed with exceptional acumen and innovative educational rotations perhaps not commonly found in Medical Physics Residency Programs. A site-specific clinical rotation will be described, where the medical physics resident follows the physician and medical resident for two weeks into patient consultations, simulation sessions, target contouring sessions, planning meetings with dosimetry, patient follow up visits, and tumor boards, to gain insight into the thought processes of the radiation oncologist...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048334/we-d-204-00-session-in-memory-of-franca-kuchnir-excellence-in-medical-physics-residency-education
#11
Kristi Hendrickson
: Speakers in this session will present overview and details of a specific rotation or feature of their Medical Physics Residency Program that is particularly exceptional and noteworthy. The featured rotations include foundational topics executed with exceptional acumen and innovative educational rotations perhaps not commonly found in Medical Physics Residency Programs. A site-specific clinical rotation will be described, where the medical physics resident follows the physician and medical resident for two weeks into patient consultations, simulation sessions, target contouring sessions, planning meetings with dosimetry, patient follow up visits, and tumor boards, to gain insight into the thought processes of the radiation oncologist...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048307/mo-c-brb-02-the-physicists-leadership-role-in-academic-radiology-the-chair-s-perspective
#12
R Arenson
: With the profound changes currently occurring in medicine, the role of the medical physicist cannot stagnate, but must evolve to meet the challenges and opportunities that are presented. Medical physicists must understand these changes and establish themselves not only as relevant but as leaders in this new environment. We must increase our presence in clinical settings such as tumor boards, patient rounds, and the development of new diagnosis, imaging, and treatment techniques. By establishing ourselves as competent scientists, we can and must participate in the development of technologies through research, teaching, and clinical implementation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048297/th-ef-bra-08-a-novel-technique-for-estimating-volumetric-cine-mri-vc-mri-from-multi-slice-sparsely-sampled-cine-images-using-motion-modeling-and-free-form-deformation
#13
W Harris, F Yin, C Wang, Z Chang, J Cai, Y Zhang, L Ren
PURPOSE: To develop a technique to estimate on-board VC-MRI using multi-slice sparsely-sampled cine images, patient prior 4D-MRI, motion-modeling and free-form deformation for real-time 3D target verification of lung radiotherapy. METHODS: A previous method has been developed to generate on-board VC-MRI by deforming prior MRI images based on a motion model(MM) extracted from prior 4D-MRI and a single-slice on-board 2D-cine image. In this study, free-form deformation(FD) was introduced to correct for errors in the MM when large anatomical changes exist...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048185/su-f-j-31-dual-energy-imaging-in-the-treatment-of-head-and-neck-tumors-a-phantom-study
#14
J Roeske, R Patel, M Surucu
PURPOSE: Organ motion, due to swallowing, can significantly affect the PTV margins used in head and neck patients. Evaluation of swallowing motion 2016 AAPM Annual Meeting Program Medical Physics, Vol. 43, No. 6, June 2016 3412 3412 may be performed using x-ray fluoroscopy. However, regions such as the soft palette and epiglottis may be difficult to visualize due to the presence of bone (mandible, teeth). The goal of this phantom study is to determine if dual energy (DE) subtraction would improve the visualization in these regions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048055/mo-c-brb-06-panel-discussion-on-leadership
#15
B Curran
: With the profound changes currently occurring in medicine, the role of the medical physicist cannot stagnate, but must evolve to meet the challenges and opportunities that are presented. Medical physicists must understand these changes and establish themselves not only as relevant but as leaders in this new environment. We must increase our presence in clinical settings such as tumor boards, patient rounds, and the development of new diagnosis, imaging, and treatment techniques. By establishing ourselves as competent scientists, we can and must participate in the development of technologies through research, teaching, and clinical implementation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047816/su-g-jep3-04-estimating-4d-cbct-from-prior-information-and-extremely-limited-angle-projections-using-structural-pca-and-weighted-free-form-deformation
#16
W Harris, F Yin, Y Zhang, L Ren
PURPOSE: To investigate the feasibility of using structure-based principal component analysis (PCA) motion-modeling and weighted free-form deformation to estimate on-board 4D-CBCT using prior information and extremely limited angle projections for potential 4D target verification of lung radiotherapy. METHODS: A technique for lung 4D-CBCT reconstruction has been previously developed using a deformation field map (DFM)-based strategy. In the previous method, each phase of the 4D-CBCT was generated by deforming a prior CT volume...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047738/th-ef-bra-02-a-novel-markerless-4d-cbct-projection-phase-sorting-technique-using-prior-knowledge-and-patient-motion-modeling-a-feasibility-study
#17
L Zhang, Y Zhang, F Yin, W Harris, J Cai, L Ren
PURPOSE: To investigate the feasibility of a novel marker-less motion-modeling based method for automatic 4D-CBCT projection phase sorting. METHODS: Patient on-board image volume at any instant is considered as a deformation of one phase of the prior planning 4D-CT. The deformation field map(DFM) is represented as a linear combination of three major deformation patterns extracted from the planning 4D-CT using principle-component-analysis(PCA). The PCA coefficients are solved for each single projection based on data fidelity constraint, and are used as motion information for phase sorting...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047683/we-d-204-01-site-specific-clinical-rotation-into-the-minds-of-the-radiation-oncologists
#18
K Hendrickson
: Speakers in this session will present overview and details of a specific rotation or feature of their Medical Physics Residency Program that is particularly exceptional and noteworthy. The featured rotations include foundational topics executed with exceptional acumen and innovative educational rotations perhaps not commonly found in Medical Physics Residency Programs. A site-specific clinical rotation will be described, where the medical physics resident follows the physician and medical resident for two weeks into patient consultations, simulation sessions, target contouring sessions, planning meetings with dosimetry, patient follow up visits, and tumor boards, to gain insight into the thought processes of the radiation oncologist...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047659/mo-c-brb-03-delivering-value-outside-the-ivory-tower
#19
D Beyer
: With the profound changes currently occurring in medicine, the role of the medical physicist cannot stagnate, but must evolve to meet the challenges and opportunities that are presented. Medical physicists must understand these changes and establish themselves not only as relevant but as leaders in this new environment. We must increase our presence in clinical settings such as tumor boards, patient rounds, and the development of new diagnosis, imaging, and treatment techniques. By establishing ourselves as competent scientists, we can and must participate in the development of technologies through research, teaching, and clinical implementation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047415/su-f-j-17-patient-localization-using-mri-guided-soft-tissue-for-head-and-neck-radiotherapy-indication-for-margin-reduction-and-its-feasibility
#20
X Qi, Y Yang, N Jack, A Santhanam, L Yang, A Chen, D Low
PURPOSE: On-board MRI provides superior soft-tissue contrast, allowing patient alignment using tumor or nearby critical structures. This study aims to study H&N MRI-guided IGRT to analyze inter-fraction patient setup variations using soft-tissue targets and design appropriate CTV-to-PTV margin and clinical implication. METHODS: 282 MR images for 10 H&N IMRT patients treated on a ViewRay system were retrospectively analyzed. Patients were immobilized using a thermoplastic mask on a customized headrest fitted in a radiofrequency coil and positioned to soft-tissue targets...
June 2016: Medical Physics
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