MRI-based treatment plan simulation and adaptation for ion radiotherapy using a classification-based approach

Radiation Oncology

Table 1 MR- and CT-related parameters for tissue from literature

Tissue	Relative electron	T1 [ms]	T2 [ms]
	density ρ_e
subcutaneous fat	0.951^a	371^d	133^d
skeleton - yellow marrow	0.982^a	365^d	133^d
brain - white matter	1.035^a	1084^c	69^c
brain - gray matter	1.035^a	1820^c	99^c
muscle	1.040^a	1412^c - 1420^d	32^d - 50^c
kidney	1.041^a	1194^c	56^c
blood	1.050^a	1932^c	275^c
liver	1.050^a	812^c	42^c
skeleton - cartilage	1.083^a	1156^c - 1240^d	27^c - 43^c
skeleton - cortical bone	1.781^a	140^b - 260^b	0.42^b - 0.50^b

^a[18], ^b[19], ^c[20], ^d[21]. All measurements were performed in vivo at 3T, values for cortical bone were measured at 1.5T and represent the relaxation time T2 ^*.

ISSN: 1748-717X