Browsing Radiotherapy and Imaging by issue date
Now showing items 1-20 of 1249
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A paradox: urgent BRCA genetic testing.
(2001-01)Diagnostic or predictive testing for germline mutations in cancer predisposition genes is inherently slow as result of both genetic counselling and mutation analysis. The overall time taken for mutation testing is not ... -
Characterization of trabecular bone by dipolar demagnetizing field MRI
(JOHN WILEY & SONS INC, 2001-10)A multiple spin-echo (MSE) sequence has been applied for the first time to study trabecular bone ex vivo. The second echo generated by the demagnetizing field presents discrete drops in signal intensity for certain values ... -
Nonperturbative real-space renormalization group scheme for the spin-1/2 XXX Heisenberg model
(AMER PHYSICAL SOC, 2001-11-01)In this paper we apply an analytical real-space renormalization group formulation which is based on numerical concepts of the density-matrix renormalization group, Within a rigorous mathematical framework we construct ... -
Performance characteristics of the novel PETRRA positron camera
(ELSEVIER SCIENCE BV, 2002-01-21)The PETRRA positron camera consists of two 60 cm x 40 cm annihilation photon detectors mounted on a rotating gantry. Each detector contains large BaF2 scintillators interfaced to large area multiwire proportional chambers ... -
Towards the evaluation of the relevant degrees of freedom in nonlinear partial differential equations
(SPRINGER, 2002-03)We investigate an operator renormalization group method to extract and describe the relevant degrees of freedom in the evolution of partial differential equations. The proposed renormalization group approach is formulated ... -
Multiple spin echoes for the evaluation of trabecular bone quality
(ELSEVIER SCIENCE BV, 2002-03)We report a simple and efficient MR method for the evaluation of trabecular bone quality. This technique is based on detection and imaging of Multiple Spin-Echoes (MSE). a manifestation of the dipolar field generated by ... -
The UK national study of magnetic resonance imaging as a method of screening for breast cancer (MARIBS).
(2002-09)The UK national study of magnetic resonance imaging as a method of screening for breast cancer (MARIBS) is in progress. The study design, accrual to date, and related research projects are described. Revised accrual rates ... -
Assessing response to treatment in breast cancer using magnetic resonance.
(2002-09)Magnetic resonance imaging provides a range of powerful techniques for assessing breast cancer. Contrast enhanced MRI has been shown to provide a sensitive method for assessing primary breast cancer, with increasing emphasis ... -
Hyperpolarised xenon in biology
(PERGAMON-ELSEVIER SCIENCE LTD, 2003-06-02) -
Scaling images using their background ratio. An application in statistical comparisons of images
(IOP PUBLISHING LTD, 2003-06-07)Comparison of two medical images often requires image scaling as a preprocessing step. This is usually done with the scaling-to-the-mean or scaling-to-the-maximum techniques which, under certain circumstances, in quantitative ... -
The evaluation of a large-area hybrid photodiode for PET applications
(ELSEVIER SCIENCE BV, 2003-11-01)A large-area hybrid photodiode interfaced to scintillating crystals is being evaluated to determine its application as part of a positron camera dedicated to imaging the breast, positron emission mammography (PEM). The ... -
The high resolution gamma imager (HRGI): a CCD based camera for medical imaging
(ELSEVIER SCIENCE BV, 2003-11-01)We describe the High Resolution Gamma Imager (HRGI): a Charge Coupled Device (CCD) based camera for imaging small volumes of radionuclide uptake in tissues. The HRGI is a collimated, scintillator-coated, low cost, high ... -
Performance of the PETRRA positron camera: reduction of scatter and randoms
(ELSEVIER SCIENCE BV, 2003-11-01)The PETRRA positron camera consists of two 60 x 40 cm(2) detectors mounted on a rotating gantry. The detectors each contain 1 cm thick BaF2 crystals interfaced to a MWPC filled with tetrakis dimethylamino ethylene (TMAE) ... -
Statistical pixelwise inference models for planar data analysis: an application to gamma-camera uniformity monitoring
(IOP PUBLISHING LTD, 2004-07-21)In this paper two tests based on statistical models are presented and used to assess, quantify and provide positional information of the existence of bias and/or variations between planar images acquired at different times ... -
Externally triggered gating of nuclear medicine acquisitions: a useful method for partitioning data
(IOP PUBLISHING LTD, 2005-04-07)Physiological gating in nuclear medicine image acquisition was introduced over 30 years ago to subdivide data from the beating heart into short time frames to minimize motion blurring and permit evaluation of contractile ... -
Antivascular cancer treatments: functional assessments by dynamic contrast-enhanced magnetic resonance imaging.
(2005-05)New anticancer therapeutics that target tumor blood vessels promise improved efficacy and tolerability in humans. Early phase 1 drug trials have shown that the maximum tolerated dose may be inappropriate for more advanced ... -
Feasibility of using ultrasound for real-time tracking during radiotherapy.
(2005-06)This study was designed to examine the feasibility of utilizing transabdominal ultrasound for real-time monitoring of target motion during a radiotherapy fraction. A clinical Acuson 128/XP ultrasound scanner was used to ... -
The PETRRA positron camera: design, characterization and results of a physical evaluation
(IOP PUBLISHING LTD, 2005-09-07)The PETRRA positron camera is a large-area (600 mm x 400 mm sensitive area) prototype system that has been developed through a collaboration between the Rutherford Appleton Laboratory and the Institute of Cancer Research/Royal ...
