1.5-T MR relaxometry in quantifying splenic and pancreatic iron : retrospective comparison of a commercial 3D-Dixon sequence and an established 2D multi-gradient echo sequence
© 2023. The Author(s)..
OBJECTIVES: To compare the quantitative measurement of splenic and pancreatic iron content using a commercial 3D-Dixon sequence (qDixon) versus an established fat-saturated R2* relaxometry method (ME-GRE).
METHODS: We analyzed splenic and pancreatic iron levels in 143 MR examinations (1.5 T) using the qDixon and a ME-GRE sequence (108 patients: 65 males, 43 females, mean age 61.31 years). Splenic and pancreatic R2* values were compared between both methods using Bland-Altman plots, concordance correlation coefficients (CCC), and linear regression analyses. Iron overload (R2* > 50 1/s) was defined for both organs and compared using contingency tables, overall agreement, and Gwet's AC1 coefficient.
RESULTS: Of all analyzable examinations, the median splenic R2* using the qDixon sequence was 25.75 1/s (range: 5.6-433) and for the ME-GRE sequence 35.35 1/s (range: 10.9-400.8) respectively. Concerning the pancreas, a median R2* of 29.93 1/s (range: 14-111.45) for the qDixon and 31.25 1/s (range: 14-97) for the ME-GRE sequence was found. Bland-Altman analysis showed a mean R2* difference of 2.12 1/s with a CCC of 0.934 for the spleen and of 0.29 1/s with a CCC of 0.714 for the pancreas. Linear regression for the spleen/pancreas resulted in a correlation coefficient of 0.94 (p < 0.001)/0.725 (p < 0.001). Concerning iron overload, the proportion of overall agreement between the two methods was 91.43% for the spleen and 93.18% for the pancreas.
CONCLUSIONS: Our data show good concordance between R2* values obtained with a commercial qDixon sequence and a validated ME-GRE relaxometry method. The 3D-qDixon sequence, originally intended for liver assessment, seems to be a reliable tool for non-invasive evaluation of iron content also in the spleen and the pancreas.
KEY POINTS: • A 3D chemical shift imaging sequence and 2D multi-gradient echo sequence show good conformity quantifying splenic and pancreatic R2* values. • The 3D chemical shift imaging sequence allows a reliable analysis also of splenic and pancreatic iron status. • In addition to the liver, the analysis of the spleen and pancreas is often helpful for further differential diagnostic clarification and patient guidance regarding the iron status.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:33 |
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| Enthalten in: |
European radiology - 33(2023), 7 vom: 17. Juli, Seite 4973-4980 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Plaikner, Michaela [VerfasserIn] |
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| Links: |
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| Themen: |
E1UOL152H7 |
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| Anmerkungen: |
Date Completed 26.06.2023 Date Revised 10.11.2023 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1007/s00330-023-09451-0 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM353064777 |
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| 041 | |a eng | ||
| 100 | 1 | |a Plaikner, Michaela |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a 1.5-T MR relaxometry in quantifying splenic and pancreatic iron |b retrospective comparison of a commercial 3D-Dixon sequence and an established 2D multi-gradient echo sequence |
| 264 | 1 | |c 2023 | |
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| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
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| 500 | |a Date Completed 26.06.2023 | ||
| 500 | |a Date Revised 10.11.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2023. The Author(s). | ||
| 520 | |a OBJECTIVES: To compare the quantitative measurement of splenic and pancreatic iron content using a commercial 3D-Dixon sequence (qDixon) versus an established fat-saturated R2* relaxometry method (ME-GRE) | ||
| 520 | |a METHODS: We analyzed splenic and pancreatic iron levels in 143 MR examinations (1.5 T) using the qDixon and a ME-GRE sequence (108 patients: 65 males, 43 females, mean age 61.31 years). Splenic and pancreatic R2* values were compared between both methods using Bland-Altman plots, concordance correlation coefficients (CCC), and linear regression analyses. Iron overload (R2* > 50 1/s) was defined for both organs and compared using contingency tables, overall agreement, and Gwet's AC1 coefficient | ||
| 520 | |a RESULTS: Of all analyzable examinations, the median splenic R2* using the qDixon sequence was 25.75 1/s (range: 5.6-433) and for the ME-GRE sequence 35.35 1/s (range: 10.9-400.8) respectively. Concerning the pancreas, a median R2* of 29.93 1/s (range: 14-111.45) for the qDixon and 31.25 1/s (range: 14-97) for the ME-GRE sequence was found. Bland-Altman analysis showed a mean R2* difference of 2.12 1/s with a CCC of 0.934 for the spleen and of 0.29 1/s with a CCC of 0.714 for the pancreas. Linear regression for the spleen/pancreas resulted in a correlation coefficient of 0.94 (p < 0.001)/0.725 (p < 0.001). Concerning iron overload, the proportion of overall agreement between the two methods was 91.43% for the spleen and 93.18% for the pancreas | ||
| 520 | |a CONCLUSIONS: Our data show good concordance between R2* values obtained with a commercial qDixon sequence and a validated ME-GRE relaxometry method. The 3D-qDixon sequence, originally intended for liver assessment, seems to be a reliable tool for non-invasive evaluation of iron content also in the spleen and the pancreas | ||
| 520 | |a KEY POINTS: • A 3D chemical shift imaging sequence and 2D multi-gradient echo sequence show good conformity quantifying splenic and pancreatic R2* values. • The 3D chemical shift imaging sequence allows a reliable analysis also of splenic and pancreatic iron status. • In addition to the liver, the analysis of the spleen and pancreas is often helpful for further differential diagnostic clarification and patient guidance regarding the iron status | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Iron overload | |
| 650 | 4 | |a Liver | |
| 650 | 4 | |a Pancreas | |
| 650 | 4 | |a Spleen | |
| 650 | 7 | |a Iron |2 NLM | |
| 650 | 7 | |a E1UOL152H7 |2 NLM | |
| 700 | 1 | |a Lanser, Lukas |e verfasserin |4 aut | |
| 700 | 1 | |a Kremser, Christian |e verfasserin |4 aut | |
| 700 | 1 | |a Weiss, Günter |e verfasserin |4 aut | |
| 700 | 1 | |a Henninger, Benjamin |e verfasserin |4 aut | |
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