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Browsing by Duke Department "Medical Physics"

Now showing items 41-60 of 66

Neutron Stimulated Emission Computed Tomography: Optimization of Acquisition Parameters Using Resolution and Dosimetry in the Context of Liver and Breast Cancers

Raterman, Gretchen Mary (2013)

Proposed is a method for investigating optimal acquisition parameters in NSECT, neutron stimulated emission computed tomography, for good image quality and low dose for diagnosing liver and breast cancers. These ...
A Novel Comprehensive Verification Method for Multifocal RapidArc Radiosurgery Treatments

Niebanck, Michael Henry (2012)

<bold>Purpose:</bold> Radiosurgery has become a widely used procedure in the treatment of both solid tumors and secondary metastases in the brain. In cases with multiple brain lesions, isocenters are typically set up ...
On-Board Imaging of Respiratory Motion: Investigation of Markerless and Self-Sorted Four-Dimensional Cone-Beam CT (4D-CBCT)

Vergalasova, Irina (2013)

To date, image localization of mobile tumors prior to radiation delivery has primarily been confined to 2D and 3D technologies, such as fluoroscopy and 3D cone-beam CT (3D-CBCT). Due to the limited information from these ...
On-board Single Photon Emission Computed Tomography (SPECT) for Biological Target Localization

Roper, Justin R (2010)

On-board imaging is useful for guiding radiation to patients in the treatment position; however, current treatment-room imaging modalities are not sensitive to physiology - features that may differentiate tumor from ...
On the Feasibility of a Novel In-Vivo Dosimeter for Brachytherapy

Vidovic, Adria Katarina (2013)

Purpose: Clinical brachytherapy systems are capable of delivering very high doses with high dose gradients. It is important therefore to be able to accurately verify the doses calculated by brachytherapy treatment ...
OPTIMIZATION OF IMAGE GUIDED RADIATION THERAPY USING LIMITED ANGLE PROJECTIONS

Ren, Lei (2009)

Digital tomosynthesis (DTS) is a quasi-three-dimensional (3D) imaging technique which reconstructs images from a limited angle of cone-beam projections with shorter acquisition time, lower imaging dose, and less mechanical ...
Optimization of RapidArc for Head-and-Neck Radiotherapy

Salazar, Jessica Emily (2011)

<bold>Purpose:</bold> The goal of this planning study is to determine which sectors of the gantry rotation are most and least important in the treatment of head-and-neck carcinomas with Intensity Modulated Arc Therapy, ...
Organ Localization: Moving Toward Patient Specific Prospective Organ Dosimetry for CT

Rybicki, Kevin (2012)

<bold>Purpose:</bold> Radiation doses from computed tomography (CT) examinations have come under public and governmental scrutiny because of several recent misadministrations of radiation across the country. Current ...
Parameterizing Image Quality of TOF versus Non-TOF PET as a Function of Body Size

Wilson, Joshua Mark (2011)

Positron emission tomography (PET) is a nuclear medicine diagnostic imaging exam of metabolic processes in the body. Radiotracers, which consist of positron emitting radioisotopes and a molecular probe, are introduced ...
Plate-Specific Gain Map Correction for the Improvement of Detective Quantum Efficiency in Computed Radiography

Schnell, Erich A. (2010)

The purpose of this work is to improve the NPS, and thus DQE, of CR images by correcting for pixel-to-pixel gain variations specific to each plate. Ten high-exposure, open field images were taken with an RQA5 spectrum, ...
Practical Considerations with the Clinical Implementation of TG-18 Guidelines

Greene, Travis C. (2010)

Quality control of soft-copy displays is critical to ensure the proper contrast rendition of medical images. The American Association of Physicists in Medicine's (AAPM) Task Group 18 (TG-18) has developed a set of ...
Prostate Bed Motion During Post Prostatectomy Radiotherapy

Xu, Zhengzheng (2012)

Purpose: To report the inter-fractional prostate bed motion (PBM), and its correlation to the mean anterior rectal wall and mean posterior bladder wall shifts during post prostatectomy radiotherapy using cone-beam ...
Quantitative 3D Optical Imaging: Applications in Dosimetry and Biophysics

Thomas, Andrew Stephen (2011)

Optical-CT has been shown to be a potentially useful imaging tool for for the two very different spheres of biologists and radiation therapy physicists, but it has yet to live up to that potential. In radiation therapy, ...
Quantitative Magnetic Susceptibility of the Developing Mouse Brain

Argyridis, Ioannis (2012)

Cerebral development involves a complex cascade of events which are difficult to visualize in vivo. In this study we combine information from Diffusion Tensor Imaging (DTI) and Quantitative Susceptibility ...
Radiation Dose and Diagnostic Accuracy in Pediatric Computed Tomography

Li, Xiang (2010)

Since its inception in the 1970's, computed tomography (CT) has revolutionized the practice of medicine and evolved into an essential tool for diagnosing numerous diseases not only in adults but also in children. The ...
A Strategy for Matching Noise Magnitude and Texture Across CT Scanners of Different Makes and Models

Solomon, Justin Bennion (2012)

<bold>Purpose: </bold> The fleet of x-ray computed tomography systems used by large medical institutions is often comprised of scanners from various manufacturers. An inhomogeneous fleet of scanners could lead to ...
SUV Analysis of F-18 FDG PET Imaging in the Vicinity of the Bladder

Allen, Colleen (2012)

Positron Emission Tomography with 18F-FDG can be used as a predictor for post-therapeutic tumor response in rectal and gynecologic cancers. An issue with assessing lesions in the vicinity of the bladder is the radioactivity ...
Time-of-Flight PET Compared to Increased Scan Time in Low-Contrast Regions

Smith, Timothy Jordan (2011)

Positron Emission Tomography is a coincidence-detection-based nuclear imaging modality that has increased in clinical prevalence over the last two decades. Measures have recently been taken to improve the practice, ...
Toward Accurate Small Animal Dosimetry and Irradiator Quality Assurance

Rodrigues, Anna Elisabeth (2012)

Purpose: To demonstrate specific methods of small animal dosimetry and quality assurance through (1) machine-specific quality assurance and (2) target-specific quality assurance (QA) protocols for different types of ...
Toward Clinically Intuitive Quality Assurance

Norris, Hannah J. (2012)

The need for clinically intuitive quality assurance procedures has been well-documented; current QA methods such as 2D gamma analysis have been shown (Nelms, Zhen et al. 2011) to be inadequate in predicting clinically ...

Now showing items 41-60 of 66

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