Characterisation of Lesions after Stereotactic Radiosurgery for Brain Metastases: Impact of Delayed Contrast Magnetic Resonance Imaging

Abstract Aims To investigate if brain metastases and radiation injuries after stereotactic radiosurgery (SRS) have different signal intensity (SI) time courses up to 55 min after contrast agent application and if delayed contrast magnetic resonance imaging (MRI) contributes to improve diagnostic acc...

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Bibliographic Details
Published in:Clinical oncology (Royal College of Radiologists (Great Britain)) 2017-03, Vol.29 (3), p.143-150
Main Authors: Wagner, S, Gufler, H, Eichner, G, Lanfermann, H
Format: Article
Language:English
Subjects:
Adult
Aged
Brain metastases
Brain Neoplasms - diagnostic imaging
Brain Neoplasms - pathology
Brain Neoplasms - surgery
Contrast Media
delayed contrast MRI
Female
gadolinium-DTPA
Hematology, Oncology and Palliative Medicine
Humans
Magnetic Resonance Imaging - methods
Male
Middle Aged
MRI
Neoplasm Metastasis - diagnostic imaging
Neoplasm Metastasis - pathology
Radiation Injuries - diagnosis
Radiation Injuries - etiology
Radiation Injuries - pathology
Radiology
radionecrosis
Radiosurgery - adverse effects
Radiosurgery - methods
stereotactic radiosurgery
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Summary:Abstract Aims To investigate if brain metastases and radiation injuries after stereotactic radiosurgery (SRS) have different signal intensity (SI) time courses up to 55 min after contrast agent application and if delayed contrast magnetic resonance imaging (MRI) contributes to improve diagnostic accuracy. Materials and methods Thirty-four consecutive patients treated with SRS for cerebral metastases were prospectively enrolled in the study. T1-weighted images were acquired on a 3-Tesla MR unit at three time points, at 2 (TP1), 15 (TP2) and 55 (TP3) min after administering contrast agent. A simultaneous, matched-pairs approach was used for region of interest analysis of the entire contrast-enhancing lesion (SI-e), the centre (SI-c), the border of the lesion (SI-b) and the adjacent non-contrast-enhancing tissue (SI-p). SIs of brain metastases and radiation injuries after SRS were compared using a two-level, linear, mixed-effects regression model. Results In total, 41 lesions were analysed: 16 metastases and 25 radiation injuries. The SI time course of SI-e, SI-c and SI-b proved to be significantly different for both entities ( P  
ISSN:0936-6555
1433-2981
DOI:10.1016/j.clon.2016.09.021