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1/2022
vol. 87 Gastrointestinal and abdominal radiology
abstract:
Original paper
Right adrenal vein identification using unenhanced magnetic resonance imaging
Koji Yamashita
1
,
Noriaki Wada
1
,
Seitaro Shin
1
,
Tetsuhiro Watanabe
2
,
Kiyomi Furuya
1
,
Shino Harada
1
,
Tomoyuki Noguchi
1
1.
Department of Radiology, Clinical Research Institute, National Hospital Organization Kyushu Medical Centre, Fukuoka 810-0065, Japan
2.
Department of Endocrine and Metabolic Diseases, Clinical Research Institute, National Hospital Organization Kyushu Medical Centre, Fukuoka 810-0065, Japan
© Pol J Radiol 2022; 87: e592-e596
Online publish date: 2022/11/02
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Introduction
Unenhanced magnetic resonance imaging (MRI) is known to be useful in characterizing adrenal adenomas through the implementation of in-phase (IPI) and opposed-phase imaging (OPI) based on chemical shift artifacts. However, whether unenhanced MRI can contribute to the identification of right adrenal vein (RAV) remains unclear. The aim of this study was to evaluate the feasibility of unenhanced MRI for the identification of RAV. Material and methods This retrospective study reviewed 30 patients (16 men; median age 60 years; range 34-76 years) who underwent MRI and subsequent adrenal venous sampling (AVS). Chemical shift MRI was acquired using echo times of 2.3 ms (OPI) and 4.6 ms (IPI) with a slice thickness of 3 mm and a gap of 1 mm. T2-weighted imaging (T2WI) was also performed. Identification of RAVs was performed by 2 independent radiologists. Inter-observer agreement on a 3-point rating scale was evaluated using κ statistics. The identification rate of RAVs was compared between OPI, IPI, and T2WI using McNemar’s test. Results Good inter-observer agreement was found for the OPI (κ = 0.744), whereas fair agreement was obtained for both other sequences (IPI: κ = 0.375; T2WI: 0.348). For both raters, the identification rate of RAVs was higher with OPI (36/60; 60.0%) than with other sequences (IPI: 16/60, 26.7%; T2WI: 9/60, 15.0%; p < 0.05, each). Conclusions OPI may play a screening role in the identification of RAVs preceding AVS, which could reduce the required radiation exposure and doses of contrast agent. keywords:
adrenal glands, magnetic resonance imaging, veins, blood specimen collection |