Development of a standardized method for contouring the larynx and its substructures

Radiation Oncology

Table 2 CT/MRI comparison of OAR volumes for five patients with locally advanced head and neck cancer

Organ at risk	CT (mean ± SD)	MRI (mean ± SD)	p value
Thyroid cartilage, cm³	8.51 ± 3.42	8.32 ± 3.07	0.50
Cricoid cartilage, cm³	3.89 ± 1.48	3.84 ± 1.49	0.82
Arytenoid cartilages, cm³	1.12 ± 0.28	1.12 ± 0.28	0.81
Suprahyoid epiglottis, cm³	1.77 ± 0.93	1.86 ± 0.72	0.58
Infrahyoid epiglottis, cm³	0.96 ± 0.80	0.84 ± 0.62	0.42
Epiglottis, cm³	2.73 ± 0.95	2.63 ± 0.87	0.17
Aryepiglottic folds/false vocal folds, cm³	7.03 ± 3.39	7.08 ± 3.47	0.58
Supraglottic larynx, cm³	12.83 ± 3.78	12.19 ± 4.71	0.23
Glottic larynx, cm³	3.14 ± 0.37	3.25 ± 0.49	0.33
Subglottic larynx, cm³	4.96 ± 1.52	5.15 ± 1.43	0.16
Larynx, cm³	34.39 ± 9.85	35.01 ± 9.47	0.09

Abbreviations: OAR = organ at risk; SD = standard deviation; CT = computed tomography-based volumes; MRI = magnetic resonance imaging-based volumes.

ISSN: 1748-717X