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https://www.readbyqxmd.com/read/27898749/-dosimetric-comparison-of-different-techniques-for-external-beam-accelerated-partial-breast-irradiation
#1
Gábor Stelczer, Tibor Major, Norbert Mészáros, Csaba Polgár, Csilla Pesznyák
The aim of this article is to evaluate and compare four different radiotherapy techniques of accelerated partial breast irradiation (APBI) considering planning quality, dosimetric and practical aspects. The investigated techniques are three dimensional conformal radiotherapy (3D-CRT), "step and shoot" (SS) and "sliding window" (SW) intensity-modulated radiotherapy, intensity-modulated arc therapy (RA). CT scans of 10 patients previously treated with APBI were selected for the study. Surgical clips were placed on the borders of the tumour bed during breast conserving surgery...
November 29, 2016: Magyar Onkologia
https://www.readbyqxmd.com/read/27860134/a-study-of-the-growth-patterns-of-breast-carcinoma-using-3d-reconstruction-a-pilot-study
#2
Andrea L Merrill, Julliette Buckley, Rong Tang, Elena Brachtel, Upahvan Rai, James Michaelson, Amy Ly, Michelle C Specht, Yukako Yagi, Barbara L Smith
Lumpectomy with microscopically clear margins is a safe and effective approach for surgical management of breast carcinoma. Margins are positive for tumor in 18-50% of lumpectomies, as it is not possible to accurately determine the shape or microscopic borders of a tumor preoperatively or intraoperatively. We examined the 3D microanatomy and growth patterns of common breast carcinoma subtypes to provide guidance for lumpectomy surgery. Prospective consent was obtained for the use of excess tissue from patients undergoing lumpectomy or mastectomy for breast carcinoma...
November 17, 2016: Breast Journal
https://www.readbyqxmd.com/read/27785471/measuring-anterior-trunk-deformity-in-scoliosis-development-of-asymmetry-parameters-using-surface-topography-a-pilot-study
#3
Patrick Knott, Baron Lonner, Mark Smith, Erin Frommeyer, Yuan Ren
BACKGROUND: Clinicians who assess and treat patients for scoliosis typically use parameters that are all visible from the posterior view. Radiographs assess the internal spinal deformity, but do not directly evaluate body shape, either posterior or anterior. This is problematic, as the patient is most concerned about the way they appear in the mirror. An objective set of anterior measurements is needed to help quantify the anterior asymmetry that is present in scoliosis. METHODS: The design of this system of assessment was developed as a consensus of thinking from four points of view...
2016: Scoliosis and Spinal Disorders
https://www.readbyqxmd.com/read/27727117/cone-beam-micro-computed-tomography-dedicated-to-the-breast
#4
Antonio Sarno, Giovanni Mettivier, Francesca Di Lillo, Mario Cesarelli, Paolo Bifulco, Paolo Russo
We developed a scanner for micro computed tomography dedicated to the breast (BµCT) with a high resolution flat-panel detector and a microfocus X-ray tube. We evaluated the system spatial resolution via the 3D modulation transfer function (MTF). In addition to conventional absorption-based X-ray imaging, such a prototype showed capabilities for propagation-based phase-contrast and related edge enhancement effects in 3D imaging. The system limiting spatial resolution is 6.2mm(-1) (MTF at 10%) in the vertical direction and 3...
October 7, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27716875/advantage-of-deep-inspiration-breath-hold-in-left-sided-breast-cancer-patients-treated-with-3d-conformal-radiotherapy
#5
Luciana Lastrucci, Simona Borghesi, Silvia Bertocci, Chiara Gasperi, Andrea Rampini, Giovanna Buonfrate, Paola Pernici, Roberta De Majo, Pietro Giovanni Gennari
PURPOSE: To compare 3D-conformal radiotherapy (3D-CRT) treatment plans based on free-breathing (FB) and deep inspiration breath hold (DIBH) and investigated whether DIBH technique enables a decrease of cardiac left anterior descending coronary artery (LADCA) and lungs dose with respect to the FB. METHODS: Twenty-three left-sided breast cancer patients referred for breast radiotherapy were included. The planning target volume (PTV) encompassed the breast and organs at risk including heart, LADCA, lungs, and contralateral breast, which were contoured in FB and DIBH CT scans...
September 27, 2016: Tumori
https://www.readbyqxmd.com/read/27689050/three-dimensional-surface-imaging-is-an-effective-tool-for-measuring-breast-volume-a-validation-study
#6
Woo Yeon Lee, Min Jung Kim, Dae Hyun Lew, Seung Yong Song, Dong Won Lee
BACKGROUND: Accurate breast volume assessment is a prerequisite to preoperative planning, as well as intraoperative decision making in breast reconstruction surgery. The use of three-dimensional surface imaging (3D scanning) to assess breast volume has many advantages. However, before employing 3D scanning in the field, the tool's validity should be demonstrated. The purpose of this study was to confirm the validity of 3D-scanning technology for evaluating breast volume. METHODS: We reviewed the charts of 25 patients who underwent breast reconstruction surgery immediately after total mastectomy...
September 2016: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/27643463/computation-of-breast-ptosis-from-3d-surface-scans-of-the-female-torso
#7
Danni Li, Audrey Cheong, Gregory P Reece, Melissa A Crosby, Michelle C Fingeret, Fatima A Merchant
Stereophotography is now finding a niche in clinical breast surgery, and several methods for quantitatively measuring breast morphology from 3D surface images have been developed. Breast ptosis (sagging of the breast), which refers to the extent by which the nipple is lower than the inframammary fold (the contour along which the inferior part of the breast attaches to the chest wall), is an important morphological parameter that is frequently used for assessing the outcome of breast surgery. This study presents a novel algorithm that utilizes three-dimensional (3D) features such as surface curvature and orientation for the assessment of breast ptosis from 3D scans of the female torso...
November 1, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27616660/tumor-stroma-containing-3d-spheroid-arrays-a-tool-to-study-nanoparticle-penetration
#8
Dwi L Priwitaningrum, Jean-Baptiste G Blondé, Adithya Sridhar, Joop van Baarlen, Wim E Hennink, Gert Storm, Séverine Le Gac, Jai Prakash
Nanoparticle penetration through tumor tissue after extravasation is considered as a key issue for tumor distribution and therapeutic effects. Most tumors possess abundant stroma, a fibrotic tissue composed of cancer-associated fibroblasts (CAFs) and extracellular matrix (ECM), which acts as a barrier for nanoparticle penetration. There is however a lack of suitable in vitro systems to study the tumor stroma penetration of nanoparticles. In the present study, we developed and thoroughly characterized a 3D co-culture spheroidal array to mimic tumor stroma and investigated the penetration of silica and PLGA nanoparticles in these spheroids...
September 9, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27488348/virtual-breast-quasi-static-elastography-vbqe-a-case-study-in-contrast-transfer-efficiency-of-viscoelastic-imaging
#9
David Rosen, Yu Wang, Jingfeng Jiang
Viscoelasticity Imaging (VEI) has been proposed to measure relaxation time constants for characterization of in vivo breast lesions. In this technique, an external compression force on the tissue being imaged is maintained for a fixed period of time to induce strain creep. A sequence of ultrasound echo signals is then utilized to generate time-resolved strain measurements. Relaxation time constants can be obtained by fitting local time-resolved strain measurements to a viscoelastic tissue model (e.g., a modified Kevin-Voigt model)...
August 2, 2016: Ultrasonic Imaging
https://www.readbyqxmd.com/read/27384301/molecular-breast-tomosynthesis-with-scanning-focus-multi-pinhole-cameras
#10
Jarno van Roosmalen, Marlies C Goorden, Freek J Beekman
Planar molecular breast imaging (MBI) is rapidly gaining in popularity in diagnostic oncology. To add 3D capabilities, we introduce a novel molecular breast tomosynthesis (MBT) scanner concept based on multi-pinhole collimation. In our design, the patient lies prone with the pendant breast lightly compressed between transparent plates. Integrated webcams view the breast through these plates and allow the operator to designate the scan volume (e.g. a whole breast or a suspected region). The breast is then scanned by translating focusing multi-pinhole plates and NaI(Tl) gamma detectors together in a sequence that optimizes count yield from the volume-of-interest...
August 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27370126/segmentation-of-malignant-lesions-in-3d-breast-ultrasound-using-a-depth-dependent-model
#11
Tao Tan, Albert Gubern-Mérida, Cristina Borelli, Rashindra Manniesing, Jan van Zelst, Lei Wang, Wei Zhang, Bram Platel, Ritse M Mann, Nico Karssemeijer
PURPOSE: Automated 3D breast ultrasound (ABUS) has been proposed as a complementary screening modality to mammography for early detection of breast cancers. To facilitate the interpretation of ABUS images, automated diagnosis and detection techniques are being developed, in which malignant lesion segmentation plays an important role. However, automated segmentation of cancer in ABUS is challenging since lesion edges might not be well defined. In this study, the authors aim at developing an automated segmentation method for malignant lesions in ABUS that is robust to ill-defined cancer edges and posterior shadowing...
July 2016: Medical Physics
https://www.readbyqxmd.com/read/27304190/the-relevance-of-using-3d-cell-cultures-in-addition-to-2d-monolayer-cultures-when-evaluating-breast-cancer-drug-sensitivity-and-resistance
#12
Susan Breslin, Lorraine O'Driscoll
Solid tumours naturally grow in 3D wherein the spatial arrangement of cells affects how they interact with each other. This suggests that 3D cell culture may mimic the natural in vivo setting better than traditional monolayer (2D) cell culture, where cells are grown attached to plastic. Here, using HER2-positive breast cancer cell lines as models (BT474, HCC1954, EFM192A), the effects of culturing cells in 3D using the poly-HEMA method compared to 2D cultures were assessed in terms of cellular viability, response/resistance to anti-cancer drugs, protein expression and enzyme activity...
June 10, 2016: Oncotarget
https://www.readbyqxmd.com/read/27292181/evaluation-of-heart-dose-for-left-sided-breast-cancer-patients-over-an-11-year-period-spanning-the-transition-from-2-dimensional-to-3-dimensional-planning
#13
Jennifer S Chang, Josephine Chen, Vivian K Weinberg, Barbara Fowble, Rajni A Sethi
INTRODUCTION/BACKGROUND: We evaluated heart dose from left breast radiotherapy with 2-dimensional (2D) versus 3-dimensional (3D) plans. PATIENTS AND METHODS: Treatment plans from patients treated with standard fractionation for left breast cancer from 2003 to 2013 were reviewed, with patients grouped into 3 cohorts: 2003 to 2004 ("2D", with computed tomography scans for dose calculation but fields defined using simulation films; n = 29), 2005 to 2006 ("2D-post," after several influential articles on heart dose were published; n = 31), and 2007 to 2013 ("3D"; n = 256)...
May 13, 2016: Clinical Breast Cancer
https://www.readbyqxmd.com/read/27236704/lecandus-study-lesion-candidate-detection-in-ultrasound-data-evaluation-of-image-analysis-algorithms-for-breast-lesion-detection-in-volume-ultrasound-data
#14
Michael Golatta, Désirée Zeegers, Konstantinos Filippatos, Leah-Larissa Binder, Alexander Scharf, Geraldine Rauch, Joachim Rom, Florian Schütz, Christof Sohn, Joerg Heil
PURPOSE: This study aims at developing and evaluating a prototype of a lesion candidate detection algorithm for a 3D-US computer-aided diagnosis (CAD) system. METHODS: Additionally, to routine imaging, automated breast volume scans (ABVS) were performed on 63 patients. All ABVS exams were analyzed and annotated before the evaluation with different algorithm blob detectors characterized by different blob-radiuses, voxel-sizes and the quantiles of blob filter responses to find lesion candidates...
August 2016: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/27203401/reducing-sar-requirements-in-multislice-volumetric-single-shot-spatiotemporal-mri-by-two-dimensional-rf-pulses
#15
Gilad Liberman, Lucio Frydman
PURPOSE: Spatiotemporal encoding (SPEN) can deliver single-scan MR images without folding complications and with increased robustness to chemical shift and susceptibility artifacts. Yet, it does so at the expense of relatively high specific absorption rates (SAR) owing to its reliance on frequency-swept pulses. This study describes SPEN implementations aimed at full three-dimensional (3D) multislice imaging, possessing reduced SAR thanks to an implementation based on new 2D radiofrequency (RF) pulses...
May 20, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27119645/imaging-extracellular-matrix-remodeling-in%C3%A2-vitro-by-diffusion-sensitive-optical-coherence-tomography
#16
Richard L Blackmon, Rupninder Sandhu, Brian S Chapman, Patricia Casbas-Hernandez, Joseph B Tracy, Melissa A Troester, Amy L Oldenburg
The mammary gland extracellular matrix (ECM) is comprised of biopolymers, primarily collagen I, that are created and maintained by stromal fibroblasts. ECM remodeling by fibroblasts results in changes in ECM fiber spacing (pores) that have been shown to play a critical role in the aggressiveness of breast cancer. However, minimally invasive methods to measure the spatial distribution of ECM pore areas within tissues and in vitro 3D culture models are currently lacking. We introduce diffusion-sensitive optical coherence tomography (DS-OCT) to image the nanoscale porosity of ECM by sensing weakly constrained diffusion of gold nanorods (GNRs)...
April 26, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27106750/a-computerized-volumetric-segmentation-method-applicable-to-multi-centre-mri-data-to-support-computer-aided-breast-tissue-analysis-density-assessment-and-lesion-localization
#17
Gokhan Ertas, Simon J Doran, Martin O Leach
Density assessment and lesion localization in breast MRI require accurate segmentation of breast tissues. A fast, computerized algorithm for volumetric breast segmentation, suitable for multi-centre data, has been developed, employing 3D bias-corrected fuzzy c-means clustering and morphological operations. The full breast extent is determined on T1-weighted images without prior information concerning breast anatomy. Left and right breasts are identified separately using automatic detection of the midsternum...
April 22, 2016: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/27099517/a-comparison-of-dosimetric-variance-for-external-beam-partial-breast-irradiation-using-three-dimensional-and-four-dimensional-computed-tomography
#18
Bing Guo, Jian-Bin Li, Wei Wang, Min Xu, Yan-Kang Li, Tong-Hai Liu
PURPOSE: To investigate the potential dosimetric benefits from four-dimensional computed tomography (4DCT) compared with three-dimensional computed tomography (3DCT) in radiotherapy treatment planning for external-beam partial breast irradiation (EB-PBI). PATIENTS AND METHODS: 3DCT and 4DCT scan sets were acquired for 20 patients who underwent EB-PBI. The volume of the tumor bed (TB) was determined based on seroma or surgical clips on 3DCT images (defined as TB3D) and the end inhalation (EI) and end exhalation (EE) phases of 4DCT images (defined as TBEI and TBEE, respectively)...
2016: OncoTargets and Therapy
https://www.readbyqxmd.com/read/27087373/-shrinkage-mode-of-the-primary-breast-tumor-after-neoadjuvant-chemotherapy-analyzed-with-part-mount-sub-serial-sectioning-and-three-dimensional-reconstruction-technique
#19
T Yang, Z P Zhang, X Y Sun, G Liu, D B Mu, Y S Wang
OBJECTIVE: The aim of this study is to evaluate the shrinkage mode of the primary tumor in women with breast cancer after neoadjuvant chemotherapy (NAC) determined by part-mount sub-serial section (PMSS) and three-dimensional (3D) reconstruction technique. METHODS: Eighty-six women with pathologically proven solitary invasive ductal carcinoma (ⅡA-ⅢC) were recruited. They were divided into two groups. Group A (n=25) received half cycles of NAC and Group B (n=61) received whole cycles of NAC...
April 2016: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/27047788/breast-volumetric-analysis-for-aesthetic-planning-in-breast-reconstruction-a-literature-review-of-techniques
#20
REVIEW
Michael P Chae, Warren Matthew Rozen, Robert T Spychal, David J Hunter-Smith
BACKGROUND: Accurate volumetric analysis is an essential component of preoperative planning in both reconstructive and aesthetic breast procedures towards achieving symmetrization and patient-satisfactory outcome. Numerous comparative studies and reviews of individual techniques have been reported. However, a unifying review of all techniques comparing their accuracy, reliability, and practicality has been lacking. METHODS: A review of the published English literature dating from 1950 to 2015 using databases, such as PubMed, Medline, Web of Science, and EMBASE, was undertaken...
April 2016: Gland Surgery
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