نتایج جستجو برای: breast phantom

تعداد نتایج: 263836  

2015
Hugo de las Heras Gala Felix Schöfer Britta Tiller Margarita Chevalier del Río Georg Zwettler Friedrich Semturs

Introduction and purpose: The latest developments in breast imaging technology have underlined the need for appropriate dosimetry and image evaluation methods for routine quality assurance. We are presenting QUART evaluation method (phantom and dosimeter) to address this need for digital x-ray mammography and breast tomosynthesis systems. We compare our dose measurements to the dose readings fr...

2014
Khalid Iqbal Kent A Gifford Geoffrey Ibbott Ryan L Grant Saeed Ahmad Buzdar

This work presents a comparison of an anthropomorphic PRESAGE® dosimeter and radiochromic film measurements with a commercial treatment planning system to determine the feasibility of PRESAGE® for 3D dosimetry in breast IMRT. An anthropomorphic PRESAGE® phantom was created in the shape of a breast phantom. A five-field IMRT plan was generated with a commercially available treatment planning sys...

Journal: :Trends in neurosciences 1990
R Melzack

The phenomenon of a phantom limb is a common experience after a limb has been amputated or its sensory roots have been destroyed. A complete break of the spinal cord also often leads to a phantom body below the level of the break. Furthermore, a phantom of the breast, the penis, or of other innervated body parts is reported after surgical removal of the structure. A substantial number of childr...

Journal: :Medical physics 2013
Amer S Kashif Thomas F Lotz Adrianus M W Heeren James G Chase

PURPOSE It is estimated that every year, 1 × 10(6) women are diagnosed with breast cancer, and more than 410,000 die annually worldwide. Digital Image Elasto Tomography (DIET) is a new noninvasive breast cancer screening modality that induces mechanical vibrations in the breast and images its surface motion with digital cameras to detect changes in stiffness. This research develops a new automa...

2016
Lida Gholamkar Ali Asghar Mowlavi Mahdi Sadeghi Mitra Athari

BACKGROUND X-ray mammography is one of the general methods for early detection of breast cancer. Since glandular tissue in the breast is sensitive to radiation and it increases the risk of cancer, the given dose to the patient is very important in mammography. OBJECTIVES The aim of this study was to determine the average absorbed dose of X-ray radiation in the glandular tissue of the breast d...

2016
Premkumar Elangovan David R Dance Kenneth C Young Kevin Wells

Virtual clinical trials are an emergent approach for the rapid evaluation and comparison of various breast imaging technologies and techniques using computer-based modeling tools. A fundamental requirement of this approach for mammography is the use of realistic looking breast anatomy in the studies to produce clinically relevant results. In this work, a biologically inspired approach has been ...

Ali Neshasteh-Riz Fereshteh Koosha, Ghazale Mansorian Mostafa Robatjazi, Reza Paydar,

Introduction: One of the treatment choices in breast cancer is Intra operative electron beam radiation therapy (IOERT). Due to high dose delivery in this procedure, shielding disk is used to protect organs at risk (OARs). In this study, we evaluate the OARs dose in the breast IOERT using Monte Carlo simulation with and without shielding disk in RANDO phantom. Material and Methods: Simulation ...

Journal: :Nursing times 2011
Dawn Fieldsen Sharon Wood

Patients usually experience phantom limb pain after amputation but it may also occur following resection of other parts of the body, such as the breast and internal organs like the rectum. The causes are complex and patients require careful assessment to ensure they receive appropriate care. This article describes the causes of phantom limb pain and discusses assessment strategies.

2001
P. M. Meaney D. Li Keith D. Paulsen

We have developed a prototype saline-coupled microwave breast imaging system with a non-contacting monopole antenna array. We have demonstrated in simulation and phantom experiments that the detection of internal features can be enhanced as the parameter reconstruction mesh approaches the exact breast perimeter. However, in the case of a homogeneous breast phantom we have also observed a centra...

2015
D. Arefan A. Talebpour N. Ahmadinejhad A. Kamali Asl

Digital Breast Tomosynthesis (DBT) is a technology that creates three dimensional (3D) images of breast tissue. Tomosynthesis mammography detects lesions that are not detectable with other imaging systems. If image reconstruction time is in the order of seconds, we can use Tomosynthesis systems to perform Tomosynthesis-guided Interventional procedures. This research has been designed to study u...

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