Zobrazeno 1 - 10
of 83
pro vyhledávání: '"Samuel J. Dwyer III"'
Publikováno v:
SPIE Proceedings.
Recent work aimed at quantifying the statistical efficiency of diagnostic imaging systems has resulted in the frequent use of the detective quantum efficiency (DQE) and noise equivalent quantum exposure (NEQ). Estimation of these metrics requires the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9897bb58a243e118492ab257f3bf44d9
https://doi.org/10.1117/12.967005
https://doi.org/10.1117/12.967005
Autor:
Tohoru Takeda, Takao Akatsuka, Mitsuo Matsuda, Yasuro Sugishita, Masayoshi Akisada, Samuel J. Dwyer III, Roger H. Schneider
Publikováno v:
SPIE Proceedings.
Without contrast material, the cardiac wall motion can be clearly described by using subtraction method. The subtracted x-ray images from an end diastolic phase image gives sufficient information to evaluate cardiac motion quantitatively. Clinical va
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5b387b9e5668f19fd729736e1093d48
https://doi.org/10.1117/12.966998
https://doi.org/10.1117/12.966998
Publikováno v:
SPIE Proceedings.
The volume of various organs in the body, including the liver and spleen, have been measured from image data obtained by the S.P.E.C.T. technique. Organ volumes were obtained by applying a semi-automated edge detection algorithm to each tomographic s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6fe7906c30dddcd86834b9d04d71878
https://doi.org/10.1117/12.967025
https://doi.org/10.1117/12.967025
Publikováno v:
SPIE Proceedings.
An algorithmic process has been developed for the non-linear enhancement of x-ray images with noisy characteristics. The enhancement process involves the application of two specialized algorithms in series. The first algorithm serves to enhance the i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d72443e39a858642e77482fe49cd1e15
https://doi.org/10.1117/12.967027
https://doi.org/10.1117/12.967027
Publikováno v:
SPIE Proceedings.
The electrical resistivity of various tissues is known to cover a wide range of values and images of resistivity distribution within a patient should show good contrast and may prove to have some diagnostic use. Data on the internal distribution of r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fadf5bc71482acc3845c1bd53f05d32
https://doi.org/10.1117/12.966976
https://doi.org/10.1117/12.966976
Publikováno v:
SPIE Proceedings.
An electronic collimation system for SPECT imaging has been designed to provide improved detection efficiency over a mechanical collimator. A maximum likelihood estimator (MLE) is derived for this prototype electronically collimated system. The data
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d9def62b634b4c4278451013b7e72eb
https://doi.org/10.1117/12.966983
https://doi.org/10.1117/12.966983
Publikováno v:
SPIE Proceedings.
A two-stage adaptive vector quantization scheme for radiographic image sequence coding is introduced. In vector quantization, an image se-quence is first mapped into a vector set; each vector is then encoded by two distinct pieces of information, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::27d2b491484344719ce53e7cdb8851b3
https://doi.org/10.1117/12.967007
https://doi.org/10.1117/12.967007
Publikováno v:
SPIE Proceedings.
Acquisition times in magnetic resonance imaging (MRI) are typically in the order of minutes. For an image of 256 x 256 pixels, the standard Fourier reconstruction technique used in most commercial imaging systems requires256 separate free induction d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4a781525946f7e65908f80cd69bd247
https://doi.org/10.1117/12.966978
https://doi.org/10.1117/12.966978
Publikováno v:
SPIE Proceedings.
Detectors of computed radiography systems have a very wide linear dynamic range Pnd enable faithful acquisition of image data, independent of the chosen x-ray exposure or the dynamic data range within the image. To yield consistently viewable images
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33a9528bb0dd5a05a7dc3d805b11fb7d
https://doi.org/10.1117/12.967021
https://doi.org/10.1117/12.967021
Publikováno v:
SPIE Proceedings.
Detection of cancerous lung nodules in chest radiographs is one of the more important tasks performed by a radiologist. In addition, the "miss rate" associated with the radiographic detection of lung nodules is approximately 30%. A computerized schem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6282574872eec4b813e4baa1331129fe
https://doi.org/10.1117/12.967022
https://doi.org/10.1117/12.967022