Temperature dosimetry using MR relaxation characteristics of poly(vinyl alcohol) cryogel (PVA‐C)

Development of a Composite Material Phantom Mimicking the Magnetic Resonance Parameters of the Neonatal Brain at 3.0 Tesla

“…The first involves "preheating of samples," a technique previously developed for temperature dosimetry. 38 In this previous study, PVA-C samples (10% and 15% PVA-C with 1 FTC and 10% PVA-C with 2 FTCs) were heated to temperatures up to 72°C, and then cooled to 20°C before MRI measurements. 38 This increased T 1 and T 2 as measured within 10 hours after preheating.…”

“…38 In this previous study, PVA-C samples (10% and 15% PVA-C with 1 FTC and 10% PVA-C with 2 FTCs) were heated to temperatures up to 72°C, and then cooled to 20°C before MRI measurements. 38 This increased T 1 and T 2 as measured within 10 hours after preheating. However, the relaxation times for the 10% sample with 1 FTC (most relevant to our work) were not stable as assessed 2 weeks later.…”