Zobrazeno 1 - 10
of 15
pro vyhledávání: '"D C, Howse"'
Publikováno v:
The European Physical Journal D. 35:307-312
An existing electron swarm apparatus has been redesigned and upgraded. In particular, the new design incorporates a novel planar radioactive foil to form an integral part of the drift tube, allowing us to overcome inherent problems present in our ear
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::616c49fa5ce2c436f2ee57f9d3c50846
https://doi.org/10.1140/epjd/e2005-00087-7
https://doi.org/10.1140/epjd/e2005-00087-7
Publikováno v:
Physics in Medicine and Biology. 37:767-777
A method to remove the interference between attenuation correction and scatter subtraction has been developed for the QPET 3D imaging system at Queen's University. Because the detector system has more than 10(10) lines of response, we reconstruct the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43b85fb176a2eda35dc9aaea0e81672d
https://doi.org/10.1088/0031-9155/37/3/019
https://doi.org/10.1088/0031-9155/37/3/019
Publikováno v:
Physics in Medicine and Biology. 36:35-46
Describes the reconstruction procedure for the three-dimensional positron imaging system, QPET, at Queen's University. Because the detectors have 1010 coincidence projection lines, the backprojection step is performed first using a new area-overlap a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ad2151271134fa1fa475f525e465066
https://doi.org/10.1088/0031-9155/36/1/004
https://doi.org/10.1088/0031-9155/36/1/004
Publikováno v:
IEEE Conference on Nuclear Science Symposium and Medical Imaging.
A method is presented for attenuation correction for The Queen's University 3-D PET (positron emission tomography) system using a flood source. Transmission data are coarsely binned into projections and the scatter contribution is subtracted. The emi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71c981d6cdd07a9ae9127818059f97b9
https://doi.org/10.1109/nssmic.1992.301092
https://doi.org/10.1109/nssmic.1992.301092
Publikováno v:
Archives of internal medicine. 153(9)
We describe a patient who had the recent onset of both primary hyperparathyroidism and parkinsonism. Surgical removal of a parathyroid adenoma was followed by spontaneous resolution of the parkinsonism. Hypoparathyroidism and other disorders of calci
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::cb2685068f407d9771904ae0df9c3bfd
https://pubmed.ncbi.nlm.nih.gov/8481080
https://pubmed.ncbi.nlm.nih.gov/8481080
Publikováno v:
IEEE transactions on medical imaging. 11(4)
A method to remove the scattered background from a reconstructed image by deconvolution with a point response function which includes the scatter contribution is presented. The amplitude of the scattered response function is obtained by constraining
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9252c855dd8bf4eea4d6a17efbbb86b4
https://pubmed.ncbi.nlm.nih.gov/18222898
https://pubmed.ncbi.nlm.nih.gov/18222898
Publikováno v:
Physics in medicine and biology. 36(5)
An accurate attenuation correction has been developed for a small-volume three-dimensional positron emission tomography (PET) system. Transmission data were measured as twenty-four 2D slices which were reconstructed and combined to form a 3D attenuat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70c1fabafbbea54803657332cc818c6a
https://pubmed.ncbi.nlm.nih.gov/2068226
https://pubmed.ncbi.nlm.nih.gov/2068226
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 269:392-403
A prototype positron emission tomography (PET) system has been designed for high-resolution imaging of small volumes. The detectors use Pb converter stacks and multiwire proportional counters (MWPC); the data acquisition components and image reconstr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::490025995bb55f3bc80cf30e15ec0f09
https://doi.org/10.1016/0168-9002(88)90512-8
https://doi.org/10.1016/0168-9002(88)90512-8
Publikováno v:
Journal of Neurochemistry. 24:925-934
—The concentration of ATP, ADP, AMP, phosphocreatine and of 5 intermediates of carbohydrate metabolism were determined in rodent brain after single and repeated seizures induced by either electroshock (ES), flurothyl or pentylenetetrazol (PTZ). In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32ddff4772cf145e9547ffb5925d0be5
https://doi.org/10.1111/j.1471-4159.1975.tb03657.x
https://doi.org/10.1111/j.1471-4159.1975.tb03657.x
Publikováno v:
IEEE Transactions on Medical Imaging. 7:198-202
Compton scattering of gamma rays within the image volume has been assessed for a large-aperture positron-emission-tomography imaging system. The Compton scattered attenuation and the Compton scattered background were both modeled and measured for poi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a2b948c2b58ae0fcbf2257d917b6226
https://doi.org/10.1109/42.7782
https://doi.org/10.1109/42.7782