Search Results - "Langton, C M"

Examination of the properties of IMRT and VMAT beams and evaluation against pre-treatment quality assurance results by Crowe, S B, Kairn, T, Middlebrook, N, Sutherland, B, Hill, B, Kenny, J, Langton, C M, Trapp, J V

“…This study aimed to provide a detailed evaluation and comparison of a range of modulated beam evaluation metrics, in terms of their correlation with QA testing…”
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The role of ultrasound in the assessment of osteoporosis : A review by NJEH, C. F, BOIVIN, C. M, LANGTON, C. M

“…Osteoporosis is now being recognized as a "silent epidemic" and there is an increasing need to improve its diagnosis and management. Quantitative ultrasound…”
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Generation of a 3D proximal femur shape from a single projection 2D radiographic image by Langton, C. M, Pisharody, S, Keyak, J. H

“…Summary Generalized Procrustes analysis and thin plate splines were employed to create an average 3D shape template of the proximal femur that was warped to…”
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Biot theory: a review of its application to ultrasound propagation through cancellous bone by Haire, T.J., Langton, C.M.

“…To facilitate an understanding of the dependence of ultrasound velocity and attenuation upon the material and structural properties of cancellous bone, several…”
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Prediction of mechanical properties of the human calcaneus by broadband ultrasonic attenuation by Langton, C.M., Njeh, C.F., Hodgskinson, R., Currey, J.D.

“…Broadband ultrasonic attenuation (dB MHz cm −1, nBUA) was determined for specimens from 20 human calcanei, along with apparent density, elasticity (Young's…”
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A comparison of time-domain and frequency-domain approaches to ultrasonic velocity measurement in trabecular bone by Nicholson, P H, Lowet, G, Langton, C M, Dequeker, J, Van der Perre, G

“…Different methods for ultrasonic velocity determination using broad-band pulse transmission have been investigated in 70 human calcanae in vitro. The work took…”
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A practical and theoretical definition of very small field size for radiotherapy output factor measurements by Charles, P. H., Cranmer-Sargison, G., Thwaites, D. I., Crowe, S. B., Kairn, T., Knight, R. T., Kenny, J., Langton, C. M., Trapp, J. V.

“…Purpose: This work introduces the concept of very small field size. Output factor (OPF) measurements at these field sizes require extremely careful…”
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The 25th anniversary of BUA for the assessment of osteoporosis: time for a new paradigm? by Langton, C M

“…The measurement of broadband ultrasonic attenuation (BUA) in cancellous bone at the calcaneus for the assessment of osteoporosis was first described within…”
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The ability of ultrasound velocity to predict the stiffness of cancellous bone in vitro by Hodgskinson, R., Njeh, C.F., Currey, J.D., Langton, C.M.

“…The mechanical status of bones is an important consideration in skeletal pathological conditions such as osteoporosis, which result in fracture at…”
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Comparison of bone mineral density and quantitative ultrasound of the calcaneus: site-matched correlation and discrimination of axial BMD status by Langton, C M, Langton, D K

“…The performance of quantitative ultrasound (QUS) and dual energy X-ray absorptiometry (DXA) bone densitometry of the calcaneus have been compared, both in…”
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Monte Carlo-based diode design for correction-less small field dosimetry by Charles, P H, Crowe, S B, Kairn, T, Knight, R T, Hill, B, Kenny, J, Langton, C M, Trapp, J V

“…Due to their small collecting volume, diodes are commonly used in small field dosimetry. However, the relative sensitivity of a diode increases with decreasing…”
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Comparison of active-set method deconvolution and matched-filtering for derivation of an ultrasound transit time spectrum by Wille, M-L, Zapf, M, Ruiter, N V, Gemmeke, H, Langton, C M

“…The quality of ultrasound computed tomography imaging is primarily determined by the accuracy of ultrasound transit time measurement. A major problem in…”
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Prediction of human femoral bone strength using ultrasound velocity and BMD : An in vitro study by NJEH, C. F, KUO, C. W, LANGTON, C. M, ATRAH, H. I, BOIVIN, C. M

“…The stiffness and strength of cancellous bone are important in the management of skeletal diseases such as osteoporosis. These properties are a function not…”
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Treatment plan complexity metrics for predicting IMRT pre-treatment quality assurance results by Crowe, S. B., Kairn, T., Kenny, J., Knight, R. T., Hill, B., Langton, C. M., Trapp, J. V.

“…The planning of IMRT treatments requires a compromise between dose conformity (complexity) and deliverability. This study investigates established and novel…”
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The non-linear relationship between BUA and porosity in cancellous bone by Hodgskinson, R, Njeh, C F, Whitehead, M A, Langton, C M

“…There is growing interest in assessing the clinical value of ultrasound in the prediction and management of osteoporosis. However, the mechanism of ultrasound…”
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Ultrasound attenuation computed tomography assessment of PAGAT gel dose by Khoei, S, Trapp, J V, Langton, C M

“…Ultrasound has been previously investigated as an alternative readout method for irradiated polymer gel dosimeters, with authors reporting varying dose…”
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The effect of very small air gaps on small field dosimetry by Charles, P H, Crowe, S B, Kairn, T, Kenny, J, Lehmann, J, Lye, J, Dunn, L, Hill, B, Knight, R T, Langton, C M, Trapp, J V

“…The purpose of this study was to investigate the effect of very small air gaps (less than 1 mm) on the dosimetry of small photon fields used for stereotactic…”
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Design and experimental testing of air slab caps which convert commercial electron diodes into dual purpose, correction‐free diodes for small field dosimetry by Charles, P. H., Cranmer‐Sargison, G., Thwaites, D. I., Kairn, T., Crowe, S. B., Pedrazzini, G., Aland, T., Kenny, J., Langton, C. M., Trapp, J. V.

“…Purpose: Two diodes which do not require correction factors for small field relative output measurements are designed and validated using experimental…”
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Male and female normative data for ultrasound measurement of the calcaneus within the UK adult population by Langton, C M, Langton, D K

“…The establishment of accurate normative data for specific populations is required before ultrasound bone densitometry may be considered for routine clinical…”
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Mobility status and bone density in cerebral palsy by Wilmshurst, S, Ward, K, Adams, J E, Langton, C M, Mughal, M Z

“…The spinal bone mineral density (SBMD) and calcaneal broadband ultrasound attenuation (BUA) was measured in 27 children with cerebral palsy. They were…”
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