Abstract
Rationale and Objectives. This study was conducted to compare the magnetic resonance (MR) contrast medium enhancement of abdominal organs in vivo with the signal intensity (SI) values of known in vitro gadolinium solutions. Materials and Methods. A phantom was imaged with the MR contrast medium gadodiamide (Omniscan; Nycomed, Princeton, NJ) of solutions at full-strength (0.5 mmol/mL), one-third, 1/10, and 1/100 concentrations. A fat-suppressed fast spoiled gradient-echo pulse sequence with flip angles ranging from 10° to 170° (at 20° increments) was performed with a 1.5-T magnet. In 12 subjects, the SIs of abdominal organs were determined with identical imaging parameters, before and after administration of gadodiamide injection at 0.1 mmol/kg. Results. As anticipated, the plot of SI in relation to gadodiamide concentration is nonlinear, with a decrease in SI due to T2 effects at concentrations above 0.05 mmol/mL. The kidney showed the highest SI after gadodiamide enhancement (125.2 ± 11.6 [standard error] at 2.5 minutes), followed by the liver (76.5 ± 11.5 at 1 minute) and spleen (57.26 ± 9.35 at 30 seconds). The SI of the renal medulla (114.2 ± 9.8 at 4.5 minutes) was approximately one-third that in phantom observations. Conclusion. The authors observed a marked discrepancy between empirical contrast medium performance in abdominal organs and SI values for comparable gadodiamide concentrations in vitro. One possible reason is the intracellular compartmentalization of water molecules in vivo. These results suggest a need for a better understanding of MR contrast medium performance in vivo.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 679-687 |
| Number of pages | 9 |
| Journal | Academic Radiology |
| Volume | 9 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2002 |
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Keywords
- Abdomen, MR
- Gadolinium
- Kidney, MR
- Magnetic resonance (MR), contrast enhancement
- Magnetic resonance (MR), experimental
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
Cite this
Gadolinium-enhanced T1-weighted renal and abdominal MR imaging : Quantitative discrepancy between clinical and in vitro findings. / Katzberg, Richard W; Ivanovic, Marija; Buonocore, Michael H.; Pellot-Barakat, Claire; Brock, John M.; Ryan, John M.; Whang, Kevin.
In: Academic Radiology, Vol. 9, No. 6, 2002, p. 679-687.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Gadolinium-enhanced T1-weighted renal and abdominal MR imaging
T2 - Quantitative discrepancy between clinical and in vitro findings
AU - Katzberg, Richard W
AU - Ivanovic, Marija
AU - Buonocore, Michael H.
AU - Pellot-Barakat, Claire
AU - Brock, John M.
AU - Ryan, John M.
AU - Whang, Kevin
PY - 2002
Y1 - 2002
N2 - Rationale and Objectives. This study was conducted to compare the magnetic resonance (MR) contrast medium enhancement of abdominal organs in vivo with the signal intensity (SI) values of known in vitro gadolinium solutions. Materials and Methods. A phantom was imaged with the MR contrast medium gadodiamide (Omniscan; Nycomed, Princeton, NJ) of solutions at full-strength (0.5 mmol/mL), one-third, 1/10, and 1/100 concentrations. A fat-suppressed fast spoiled gradient-echo pulse sequence with flip angles ranging from 10° to 170° (at 20° increments) was performed with a 1.5-T magnet. In 12 subjects, the SIs of abdominal organs were determined with identical imaging parameters, before and after administration of gadodiamide injection at 0.1 mmol/kg. Results. As anticipated, the plot of SI in relation to gadodiamide concentration is nonlinear, with a decrease in SI due to T2 effects at concentrations above 0.05 mmol/mL. The kidney showed the highest SI after gadodiamide enhancement (125.2 ± 11.6 [standard error] at 2.5 minutes), followed by the liver (76.5 ± 11.5 at 1 minute) and spleen (57.26 ± 9.35 at 30 seconds). The SI of the renal medulla (114.2 ± 9.8 at 4.5 minutes) was approximately one-third that in phantom observations. Conclusion. The authors observed a marked discrepancy between empirical contrast medium performance in abdominal organs and SI values for comparable gadodiamide concentrations in vitro. One possible reason is the intracellular compartmentalization of water molecules in vivo. These results suggest a need for a better understanding of MR contrast medium performance in vivo.
AB - Rationale and Objectives. This study was conducted to compare the magnetic resonance (MR) contrast medium enhancement of abdominal organs in vivo with the signal intensity (SI) values of known in vitro gadolinium solutions. Materials and Methods. A phantom was imaged with the MR contrast medium gadodiamide (Omniscan; Nycomed, Princeton, NJ) of solutions at full-strength (0.5 mmol/mL), one-third, 1/10, and 1/100 concentrations. A fat-suppressed fast spoiled gradient-echo pulse sequence with flip angles ranging from 10° to 170° (at 20° increments) was performed with a 1.5-T magnet. In 12 subjects, the SIs of abdominal organs were determined with identical imaging parameters, before and after administration of gadodiamide injection at 0.1 mmol/kg. Results. As anticipated, the plot of SI in relation to gadodiamide concentration is nonlinear, with a decrease in SI due to T2 effects at concentrations above 0.05 mmol/mL. The kidney showed the highest SI after gadodiamide enhancement (125.2 ± 11.6 [standard error] at 2.5 minutes), followed by the liver (76.5 ± 11.5 at 1 minute) and spleen (57.26 ± 9.35 at 30 seconds). The SI of the renal medulla (114.2 ± 9.8 at 4.5 minutes) was approximately one-third that in phantom observations. Conclusion. The authors observed a marked discrepancy between empirical contrast medium performance in abdominal organs and SI values for comparable gadodiamide concentrations in vitro. One possible reason is the intracellular compartmentalization of water molecules in vivo. These results suggest a need for a better understanding of MR contrast medium performance in vivo.
KW - Abdomen, MR
KW - Gadolinium
KW - Kidney, MR
KW - Magnetic resonance (MR), contrast enhancement
KW - Magnetic resonance (MR), experimental
UR - http://www.scopus.com/inward/record.url?scp=0035985302&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035985302&partnerID=8YFLogxK
U2 - 10.1016/S1076-6332(03)80313-6
DO - 10.1016/S1076-6332(03)80313-6
M3 - Article
C2 - 12061742
AN - SCOPUS:0035985302
VL - 9
SP - 679
EP - 687
JO - Academic Radiology
JF - Academic Radiology
SN - 1076-6332
IS - 6
ER -