Comparison between Two Separate Injections and a Single Injection of Double-dose Contrast Medium for Contrast-enhanced MR Imaging of Metastatic Brain Tumors
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- OCHI Tomoko
- Department of Radiology, Nara Medical University Department of Radiology, Nara Prefectural Mimuro Hospital
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- TAOKA Toshiaki
- Department of Radiology, Nara Medical University
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- MATSUDA Ryosuke
- Department of Neurosurgery, Nara Medical University
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- SAKAMOTO Masahiko
- Department of Radiology, Nara Medical University
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- AKASHI Toshiaki
- Department of Radiology, Nara Medical University
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- TAMAMOTO Tetsuro
- Department of Radiation Oncology, Nara Medical University
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- SUGIMOTO Tadashi
- Department of Neurosurgery, Nara Medical University
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- SAKAGUCHI Hiroshi
- Department of Radiology, Nara Prefectural Mimuro Hospital
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- HASEGAWA Masatoshi
- Department of Radiation Oncology, Nara Medical University
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- NAKASE Hiroyuki
- Department of Neurosurgery, Nara Medical University
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- KICHIKAWA Kimihiko
- Department of Radiology, Nara Medical University
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Abstract
Purpose: As stereotactic radiotherapy (SRT) becomes widespread, precise information including number, location, and margin of lesions is required when magnetic resonance (MR) imaging of brain metastasis is performed. We compare methods using 2 separate injections and a single injection for the administration of a double dose of contrast medium for contrastenhanced MR imaging.<br/>Materials and Methods: We divided 40 patients with brain metastasis into 2 groups of 20 patients. Group A received 2 separate injections (0.2 + 0.2 mL/kg) of contrast medium (gadoteridol); Group B received a single injection of the same total dose (0.4 mL/kg). Group A underwent spin echo (SE) T1-weighted imaging (T1WI) and magnetization prepared rapid acquisition with gradient echo sequence (MPRAGE) after each injection, and Group B underwent the same MR studies at the same timing as Group A. We evaluated the number, signal-to-noise ratio (SNR), diameter, margin delineation, and volume of lesions and compared them between early and delayed studies by the 2 methods.<br/>Results: The number of detected lesions was largest in delayed studies of MPRAGE in both groups. The SNR of the lesions was statistically lower in early studies of Group A than other studies. Delayed studies of Group B showed statistically better margin delineation than other studies on both SE-T1WI and MPRAGE studies. Diameter and enhanced volume were statistically significantly larger on delayed phase than early phase in both groups.<br/>Conclusion: Use of a single injection of double-dose contrast medium and longer delay time may improve margin delineation of lesions for the study of brain metastasis. Enhanced volume was larger on delayed phase, and it may influence selection of therapeutic strategy.
Journal
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- Magnetic Resonance in Medical Sciences
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Magnetic Resonance in Medical Sciences 13 (4), 221-229, 2014
Japanese Society for Magnetic Resonance in Medicine
