Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Douglas A. Ortendahl"'
Autor:
L Kaufman, Douglas A. Ortendahl
Publikováno v:
Computers in Biology and Medicine. 25:293-300
With the advent of magnetic resonance fluoroscopic imaging, it is possible to obtain images at a rate which can be considered effectively real-time. Image refresh rates can be as low as 0.5 s. Such rates are fast enough to allow MR to be used for gui
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ca0903795b7061f058f10e2ca07f6fe
https://doi.org/10.1016/0010-4825(94)00012-f
https://doi.org/10.1016/0010-4825(94)00012-f
Autor:
Douglas A. Ortendahl
Publikováno v:
IEEE Transactions on Nuclear Science. 41:1634-1638
Selective averaging, where different lines in k-space are accumulated with a different number of acquisitions has previously been shown to introduce texture and mottling into magnetic resonance (MR) images. Here a theoretical framework for understand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44362f72683ad9851e76f65c42f12f0c
https://doi.org/10.1109/23.322960
https://doi.org/10.1109/23.322960
Publikováno v:
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society.
Purpose To study the effects of T1, T2 changes due to field difference on imaging contrast C and signal difference-to-noise K between a certain tumor model, mammary adenocarcinoma, and muscle. The results may provide a guide in optimizing the imaging
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39cfb190659157c00e2b0a1b4cd97020
https://doi.org/10.1109/iembs.1992.5762131
https://doi.org/10.1109/iembs.1992.5762131
Publikováno v:
SPIE Proceedings.
A cost-effective display system has been developed and incorporated into a low-cost magnetic resonance imager. A single graphics board (Peritek VCD) with an on-board 68030 CPU, ACRTC graphics controller and 1024 X 1024 12 bit video RAM is interfaced
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47c8dd48c00c858bcb708a49881524c8
https://doi.org/10.1117/12.59524
https://doi.org/10.1117/12.59524
Publikováno v:
Tissue Characterization in MR Imaging ISBN: 9783642749957
In magnetic resonance imaging (MRI), the signal intensity depends indirectly on particular physical and chemical characteristics of the tissues being imaged. These tissue properties influence the behavior of the nuclei undergoing resonance and their
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::216f37bd007d6493e45387b50bc767f0
https://doi.org/10.1007/978-3-642-74993-3_20
https://doi.org/10.1007/978-3-642-74993-3_20
Publikováno v:
IEEE Transactions on Nuclear Science. 29:784-788
Room temperature semiconductors are potentially attractive candidates for gamma cameras because of their compactness and high spatial resolution. We have evaluated position-sensitive HgI2 detectors for use in high resolution small area gamma cameras.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7c3be5e945545806e70fdce073d3a08
https://doi.org/10.1109/tns.1982.4335959
https://doi.org/10.1109/tns.1982.4335959
Autor:
J C Watts, Peter L. Davis, Alexander R. Margulis, Douglas A. Ortendahl, Lawrence E. Crooks, C.R. Cannon, Michael Brant-Zawadzki, Mitsuaki Arakawa, L Kaufman, J Hoenninger
Publikováno v:
Radiology. 146:123-128
Advances in imaging technique have improved the efficiency of clinical nuclear magnetic resonance (NMR) imaging, and will allow total patient examination time that equals or is more favorable than that of x-ray computed tomography (CT). The whole hea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c066e197da17b4ac0b193e2c4f197def
https://doi.org/10.1148/radiology.146.1.6849032
https://doi.org/10.1148/radiology.146.1.6849032
Publikováno v:
Oral Surgery, Oral Medicine, Oral Pathology. 66:102-110
Ambiguities in diagnoses can often be resolved when images from different imaging modalities are compared, and when images are processed with algorithms that improve resolution and contrast. Bayesean deblurring algorithms were developed and applied t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0dcbaf55665ad71c6daa6e7606330e8
https://doi.org/10.1016/0030-4220(88)90076-x
https://doi.org/10.1016/0030-4220(88)90076-x
Autor:
D. Chu, David C. Price, C. B. Lim, Robert S. Hattner, Leon Kaufman, Douglas A. Ortendahl, A. Cheng, R. Semper, V. Perez-Mendez
Publikováno v:
Nuclear Instruments and Methods. 156:33-40
A MWPC camera for nuclear medicine imaging with positron emitting isotopes has been built. The two planar detectors are converter coupled MWPC with sensitive area 48×48 cm2 placed 50 cm apart with clear space in between for the patient. The effectiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::037ad3c1ef023a04c06bf987234e8c99
https://doi.org/10.1016/0029-554x(78)90688-2
https://doi.org/10.1016/0029-554x(78)90688-2
Autor:
D. Faulkner, Louis T. Kircos, N.I. Chafetz, Robert C. Taylor, Robert S. Hattner, Douglas A. Ortendahl
Publikováno v:
Oral Surgery, Oral Medicine, Oral Pathology. 65:249-254
Signs and symptoms of craniomandibular dysfunction in 37 patients were compared with the results of corrected cephalometric tomography and an emission imaging protocol consisting of both planar and single photon emission computed tomography (SPECT) (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::449c195bbf001d858f05368af5553664
https://doi.org/10.1016/0030-4220(88)90175-2
https://doi.org/10.1016/0030-4220(88)90175-2