NCT02062372

Spatial Analysis and Validation of Glioblastoma on 7 T MRI

• Status: Terminated
• Phase: N/A
• Study type: Interventional
• Enrollment: 5 (actual)
• Sponsor: Maastricht Radiation Oncology · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Currently, patients with a glioblastoma multiforme (GBM) are treated with a combination of different therapeutic modalities including resection, concurrent chemo- and radiotherapy and adjuvant temozolomide. However, survival is still poor and most of these tumours recur within one to two years within the previously irradiated target volume. The radiation target volume encompasses both the contrast-enhanced lesion on T1-weighted magnetic resonance imaging (MRI), plus a 1.5 - 2 cm isotropic margin in order to include microscopic speculated growth. These margins result in a high dose to surrounding healthy appearing brain tissue. Moreover, the short progression-free survival indicates a possible geographical miss. There is a clear need for novel imaging techniques in order to better determine the degree of tumour extent at the time of treatment and to minimize the dose to healthy brain tissue. The development of Ultra-High Field (UHF) MRI at a magnetic field strength of 7 Tesla (T) provides an increased ability to detect, quantify and monitor tumour activity and determine post-treatment effects on the normal brain tissue as a result of a higher resolution, greater coverage and shorter scan times compared to 1.5 T and 3 T images. Up to now, only few investigators have examined the use of UHF MRI in patients with malignant brain tumours. These studies show its potential to assess tumour microvasculature and post-radiation effects such as microhaemorrhages. This study analyzes the accuracy of the 7T MRI in identifying the gross tumour volume (GTV) in patients with an untreated GBM by comparing biopsy results to 7T images. These biopsies will be taken from suspected regions of GBM based on 7T MRI that do not appear as such on 3T MRI. We hypothesize that with the 7T MRI the GTV can be more accurately and extensively identified when compared to the 3T MRI.

Conditions

• Glioblastoma

Interventions

Type	Name	Description
DEVICE	7 T MRI	Overview Technical DetailsField strength: 7 Tesla Bore size: 60 cm System length: 317,5 cm RF power: 7,5 kW / 8x1 kW Gradient strength: SC 72 Gradients (max. 70 mT/m @ 200 T/m/s) Helium Consumption: Zero Helium boil-off technology
PROCEDURE	Biopsy	During surgery patients will receive standard biopsies plus one study biopsy from a region of interest. The neuro-surgeon will determine the feasibility of the extra biopsy and the optimal biopsy tract. A screen capture from the neuronavigation system will be saved for each biopsy to relate the findings on 3T and 7T MRI to histopathology.

Timeline

• Start date: 2014-12-10
• Primary completion: 2018-02-05
• Completion: 2018-02-05
• First posted: 2014-02-13
• Last updated: 2018-08-17

Locations

1 site across 1 country: Netherlands