We hypothesised that T1 relaxation curves sampled with very high temporal resolution reflect the existence of several environments in healthy and brain tumour tissue. Relaxation properties of healthy as well as tumour tissue, identified by FET-PET in a hybrid MR-PET environment, were investigated using a Look-Locker inversion recovery sequence sampled with a 17ms time resolution and 460 time points. The properties of normal appearing tissue were very similar in patients and healthy volunteers. In addition, a novel component was identified in brain tumour patients, which seems characteristic of the presence of tumour and oedema.
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