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Results 1 - 10
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693
Stereoscopic Interpretation of Low-Dose Breast Tomosynthesis Projection Images
"... Abstract The purpose of this studywas to evaluate stereoscopic perception of low-dose breast tomosynthesis projection images. In this Institutional Review Board exempt study, craniocaudal breast tomosynthesis cases (N=47), consisting of 23 biopsy-proven malignant mass cases and 24 normal cases, were ..."
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Abstract The purpose of this studywas to evaluate stereoscopic perception of low-dose breast tomosynthesis projection images. In this Institutional Review Board exempt study, craniocaudal breast tomosynthesis cases (N=47), consisting of 23 biopsy-proven malignant mass cases and 24 normal cases
BREAST TOMOSYNTHESIS RECONSTRUCTION
"... Abstract. Digital tomosynthesis imaging is becoming increasingly significant in a variety of medical imaging applications. Tomosynthesis imaging involves the acquisition of a series of projection images over a limited angular range, which, after reconstruction, results in a pseudo-3D representation ..."
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of the imaged object. The partial separation of features in the third dimension improves the visibility of lesions of interest by reducing the effect of the superimposition of tissues. In breast cancer imaging, tomosynthesis is a viable alternative to standard mammography; however, current algorithms for image
Comparison of Different Reconstruction Algorithms for Decreasing the Exposure Dose during Digital Breast Tomosynthesis: A Phantom Study
, 2015
"... We compared reconstruction algorithms [filtered back projection (FBP), maximum likelihood ex-pectation maximization (MLEM), and the simultaneous iterative reconstruction technique (SIRT)] in terms of the radiation dose and image quality, for exploring the possibility of decreasing the radiation dose ..."
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dose during digital breast tomosynthesis (DBT). The three algorithms were implemented using a DBT system and experimentally evaluated using measurements, such as signal difference-to-noise ratio (SDNR) and intensity profile, on a BR3D phantom (in-focus plane image). The possi-ble radiation dose
Digital Tomosynthesis of the Chest: Comparison of Patient Exposure Dose and Image Quality between
"... Digital tomosynthesis (DT) refers to the technique of collecting a number of projection radiographs at very low ..."
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Digital tomosynthesis (DT) refers to the technique of collecting a number of projection radiographs at very low
Assessing and Improving Cobalt-60 Digital Tomosynthesis Image Quality
"... Image guidance capability is an important feature of modern radiotherapy linacs, and future cobalt-60 units will be expected to have similar capabilities. Imaging with the treatment beam is an appealing option, for reasons of simplicity and cost, but the dose needed to produce cone beam CT (CBCT) im ..."
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) images in a Co-60 treatment beam is too high for this modality to be clinically useful. Digital tomosynthesis (DT) offers a quasi-3D image, of sufficient quality to identify bony anatomy or fiducial markers, while delivering a much lower dose than CBCT. A series of experiments were conducted on a
A natural model of Leishmania major infection reveals a prolonged “silent” phase of parasite amplification in the skin before the onset of lesion formation and immunity
, 2000
"... A model of Leishmania major infection in C57BL/6 mice has been established that combines two main features of natural transmission: low dose (100 metacyclic promastigotes) and inoculation into a dermal site (the ear dermis). The evolution of the dermal lesion could be dissociated into two distinct p ..."
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Cited by 79 (19 self)
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A model of Leishmania major infection in C57BL/6 mice has been established that combines two main features of natural transmission: low dose (100 metacyclic promastigotes) and inoculation into a dermal site (the ear dermis). The evolution of the dermal lesion could be dissociated into two distinct
Pulmonary toxicity of single-walled carbon nanotubes in mice 7 and 90 days after intratracheal instillation.
- Toxicol. Sci.
, 2004
"... Nanomaterials are part of an industrial revolution to develop lightweight but strong materials for a variety of purposes. Singlewall carbon nanotubes are an important member of this class of materials. They structurally resemble rolled-up graphite sheets, usually with one end capped; individually t ..."
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Cited by 104 (1 self)
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generally similar. One of the mice in the 7-d group had a low-grade granulomatous reaction DISCUSSION The present study shows that all three NT products, regardless of the type and amount of metal impurities they contained, induced dose-dependent lung lesions characterized chiefly by interstitial
Low-Contrast Lesion Detection in Tomosynthetic Breast Imaging Using A Realistic Breast Phantom
"... Tomosynthesis mammography is a potentially valuable technique for detection of breast cancer. In this simulation study, we investigate the efficacy of three different tomographic reconstruction methods, EM, SART and Backprojection, in the context of an especially difficult mammographic detection tas ..."
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task. The task is the detection of a very low-contrast mass embedded in very dense fibro-glandular tissue — a clinically useful task for which tomosynthesis may be well suited. The project uses an anatomically realistic 3D digital breast phantom whose normal anatomic variability limits lesion
Low-dose Radiation
"... www.PRSGO.com 1 Lymphedema is a debilitating condition that is characterized by the abnormal collection of fluid and proteins within the interstitium. Dysfunctional lymphatic vessels cause lymphatic fluid stasis, decreased macrophage function, and chronic inflammation and fibrosis.1 It is often a su ..."
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nodes followed by 20 Gy (group II) radiation in Sprague-Dawley rats (350–400 g). Tc99 lymphoscintigraphy was used to monitor lymphatic flow patterns. Volume differentiation was assessed by microcomputed tomography and defined as the percentage change of the lesioned limb compared to the healthy limb
Myocardial Repair with Long-Term and Low-Dose Administration
"... Objective- To study the healing process of the myo-cardium in hypertensive rats undergoing inhibition of nitric oxide synthesis. Methods – Two groups of animals were studied: one received L-NAME, 12mg/kg/day, and the other was a control group. The presence of type III collagen, fibro-nectin, and a-s ..."
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-smooth muscle actin-positive cells was assessed by immunohistochemistry. Results – Fibronectin was seen in both early and late lesions, while type III collagen was seen mainly in areas of incomplete healing, situated among myocytes and around the intramyocardial branches of the coronary arteries. Areas
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