Image artifacts due to a time-varying contrast medium concentration in 3D contrast-enhanced MRA

1999 ◽  
Vol 10 (6) ◽  
pp. 919-928 ◽  
Author(s):  
Jonas Svensson ◽  
J. Stefan Petersson ◽  
Freddy St�hlberg ◽  
Elna-Marie Larsson ◽  
Peter Leander ◽  
...  
Keyword(s):  
Contrast Medium ◽  
Image Artifacts ◽  
Time Varying ◽  
Medium Concentration ◽  
Contrast Enhanced ◽  
Contrast Medium Concentration

Coronary CT angiography by modifying tube voltage and contrast medium concentration: Evaluation of image quality and radiation dose

2019 ◽  
Vol 36 (7) ◽  
pp. 1391-1396 ◽  
Author(s):  
Seyede Shokoofeh Mousavi Gazafroudi ◽  
Mohammad Bagher Tavakkoli ◽  
Maryam Moradi ◽  
Seyede Shabnam Mousavi Gazafroudi ◽  
Ghasem Yadegarfar ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Contrast Medium ◽  
Ct Angiography ◽  
Coronary Ct Angiography ◽  
Tube Voltage ◽  
Medium Concentration ◽  
Coronary Ct ◽  
Contrast Medium Concentration

Accuracy of Digital Videodensitometry in Quantitating Contrast Medium Concentration

1994 ◽  
Vol 35 (4) ◽  
pp. 378-382
Author(s):  
X. M. Yang ◽  
H. Manninen ◽  
H. X. Ji ◽  
P. Vainio ◽  
S. Soimakallio
Keyword(s):  
Contrast Medium ◽  
Region Of Interest ◽  
Accurate Method ◽  
Average Density ◽  
Plastic Tube ◽  
Peak Density ◽  
Time To Peak ◽  
Medium Concentration ◽  
Time Density ◽  
Contrast Medium Concentration

To evaluate the accuracy of digital videodensitometric technique in directly quantitating concentration of contrast medium, iohexol 300 mg I/ml was injected into a 2-mm-diameter plastic tube, in which clean water was circulated at a 190 ml/min flow, for digital subtraction angiography. Altogether 27 injections were performed with 3, 4 and 5 ml volumes at 3-, 4- and 5-ml/s flows of the contrast medium. A time-density curve was achieved by selecting a “vessel” region of interest (ROI) and a background ROI. Then, a frame corresponding to the maximum opacification of the contrast medium could be calculated. Finally, the average density and the time to peak density of the contrast medium were obtained. The average density was statistically higher (p < 0.01) with 5 ml/s flow than with 4- and 3-ml/s flows. Times to peak density reduced as injection flows or volumes increased. The results support the conclusion that digital videodensitometric technique is an accurate method for quantitation of contrast medium concentration during angiography. The angiographic opacification may be improved by injecting the iodine contrast medium with higher flows or larger volumes.

Accuracy of Digital Videodensitometry in Quantitating Contrast Medium Concentration

1994 ◽  
Vol 35 (4) ◽  
pp. 378-382
Author(s):  
X. M. Yang ◽  
H. Manninen ◽  
H. X. Ji ◽  
P. Vainio ◽  
S. Soimakallio
Keyword(s):  
Contrast Medium ◽  
Medium Concentration ◽  
Contrast Medium Concentration

Contrast Medium Concentration in Epithelial Mucosal Cells after Colonic Instillation of Iodixanol

2002 ◽  
Vol 9 (4) ◽  
pp. 379-385 ◽  
Author(s):  
Rune Andersen ◽  
Kåre E. Tvedt ◽  
Asbjørn Nordby ◽  
Frode Læaerum
Keyword(s):  
Contrast Medium ◽  
Medium Concentration ◽  
Mucosal Cells ◽  
Contrast Medium Concentration

scholarly journals ESTIMATION OF GLOMERULAR FILTRATION RATE FROM THE URINARY EXCRETED CONTRAST MEDIUM CONCENTRATION

1990 ◽  
Vol 81 (5) ◽  
pp. 719-725
Author(s):  
Koichi Kambe ◽  
Katsuyuki Taguchi ◽  
Toshinori Saitoh ◽  
Naomasa Ioritani ◽  
Shuichi Shirai ◽  
...  
Keyword(s):  
Glomerular Filtration Rate ◽  
Contrast Medium ◽  
Glomerular Filtration ◽  
Filtration Rate ◽  
Medium Concentration ◽  
Contrast Medium Concentration
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