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Tumour size measurement in a mouse model using high resolution MRI.

Artikel i vetenskaplig tidskrift
Författare Mikael Montelius
Maria Ljungberg
Michael Horn
Eva Forssell-Aronsson
Publicerad i BMC medical imaging
Volym 12
Nummer/häfte 1
Sidor 12
ISSN 1471-2342
Publiceringsår 2012
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för radiofysik
Sidor 12
Språk en
Länkar dx.doi.org/10.1186/1471-2342-12-12
https://gup.ub.gu.se/file/90053
Ämnesord Animal model, Magnetic resonance, Volume determination, Cancer
Ämneskategorier Radiologi, Diagnostisk radiologi, Radiofysik, Cancer och onkologi, Medicinsk teknik

Sammanfattning

ABSTRACT: BACKGROUND: Animal models are frequently used to assess new treatment methods in cancer research. MRI offers a non-invasive in vivo monitoring of tumour tissue and thus allows longitudinal measurements of treatment effects, without the need for large cohorts of animals. Tumour size is an important biomarker of the disease development, but to our knowledge, MRI based size measurements have not yet been verified for small tumours (102-101g). The aim of this study was to assess the accuracy of MRI based tumour size measurements in small tumours on mice. METHODS: 2D and 3D T2-weighted RARE images of tumour bearing mice were acquired in vivo using a 7 T dedicated animal MR system. For the 3D images the acquired image resolution was varied. The images were exported to a PC workstation where the tumour mass was determined assuming a density of 1 g/cm3, using an in-house developed tool for segmentation and delineation. The resulting data were compared to the weight of the resected tumours after sacrifice of the animal using regression analysis. RESULTS: Strong correlations were demonstrated between MRI-and necropsy determined masses. In general, 3D acquisition was not a prerequisite for high accuracy. However, it was slightly more accurate than 2D when small (<0.2 g) tumours were assessed for inter-and intraobserver variation. In 3D images, the voxel sizes could be increased from 1603um3 to 2403um3 without affecting the results significantly, thus reducing acquisition time substantially. CONCLUSIONS: 2D MRI was sufficient for accurate tumour size measurement, except for small tumours (<0.2g) where 3D acquisition was necessary to reduce interobserver variation. Acquisition times between 15 and 50 minutes, depending on tumour size, were sufficient for accurate tumour volume measurement. Hence, it is possible to include further MR investigations of the tumour, such as tissue perfusion, diffusion or metabolic composition in the same MR session.

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