Table 1. T1 Relaxation times of different materials for tissue surrogates used in the experiment.

Phantom, TMM	T1 (average SD, ms), 3T Siemens MR Scanner
Fibroglandular shell	No signal
Skin/outer shell	No signal
Silicone rubber	577.2±107.8
Silicone rubber with fish oil	902.1±120.5
Fresh silicone rubber	638.3±108.5
Silicone oil 50 mm2/s*	1,515.8±105.5
Peanut oil (Basso)	405.4±15.1
Peanut oil (pressed purity)	404.1±10.5
Agarose gel 0.5 wt%	4015.5±100.2
Agarose gel 1.0 wt%	3,877.8±130.5
Agarose gel 1.5 wt%	3,404.8±255.9
Agarose gel 2.0 wt%	3,572.6±100.4
Agarose gel 2.5 wt%	3,617.2±101.5

*, Viscosity unit. TMM, tissue-mimicking material.