Article Figures & Data
Figures
- Fig 1.
MR imaging–based volumetric analysis of a carcinoma on the left side of the base of the tongue in a 54-year-old man.
A and B, Two sequential axial T2-weighted MR images (4000/100/2) were used to outline the primary tumor on each sequential axial image by using a mouse-controlled cursor. In this case, the neoplasm (outlined) is hypointense relative to the lymphoid tissue (L) of the lingual tonsil.
C, Serial axial T2-weighted MR images (4000/100/2) show all images where a primary tumor is present, and the outlines of the tumor on each section. A computer program calculated the volume by counting voxels included within the outlined regions.
- Fig 2.
MR imaging–based volumetric analysis of a regional nodal metastasis in a patient with a primary cancer at the base of the tongue.
A and B, Two sequential axial T2-weighted images show how the nodal mass was outlined within a mouse-controlled cursor.
C, Serial axial T2-weighted MR images (4000/100/2) show all images on which nodal metastases are outlined and the outlines on each image.
Tables
Patient (No.) Tumor Location Stage MR Imaging Time Points Percentage Measurement Error, % 1 Base of tongue T4 2 23*, 19 2 Pyriform sinus T4 3 18, 20, 16 3 Base of tongue T3 5 5, 7, 12, 17, 2 4 Base of tongue T4 1 0 5 Tonsil T4 3 1, 2, 10 6 Tonsil T3 4 1, 3, 22†, 29† 7 Base of tongue T3 0‡ None 8 Tonsil T4 3 6, 15, 53† 9 Base of tongue T2 4 13, 8, 37*, 11 10 Base of tongue T3 2 16, 11 11 Base of tongue T2 3 1, 3, 12 12 Base of tongue T2 3§ 29*, 22*, 2 13 Base of tongue T3 3 4, 8, 19 14 Base of tongue T4 3 9, 3, 22† 15 Pyriform sinus T4 3 7, 2, 23† 16 Tonsil T2 3 0, 13, 26† 17 Base of tongue T2 3 4, 4, 2 * Percentage measurement error was greater than 20% because of difficulty in differentiating the neoplasm from adjacent lymphoid tissue at the base of the tongue.
† Percentage measurement error was greater than 20% because of a small absolute differences in the volume measurements of small lesions.
‡ The primary tumor was too large to measure.
§ T1-weighted images were used because of artifact on T2-weighted images.
Patient (No.) Stage Nodal Level MR Imaging Time Points Percentage Measurement Error, % 1 N0 None 0* None 2 N2c L II/III 4 14, 13, 11, 11 3 N2b R II 5 2, 1, 3, 9, 31† 4 N2c R II/III 3 2, 7, 3 5 N2c R II/III 3 1, 2, 10 6 N2b L II-IV 4 1, 1, 3, 8 7 N2c R II/III 3 14, 26‡, 4 8 N2a R II 3 5, 1, 4 9 N2b R II 4 4, 12, 0, 11 10 N2b R II/III 2 3, 30† 11 N2a L II 3 4, 1, 1 12 N3 R II 3 17, 16, 27* 13 N2b R II 3 3, 17, 17 14 N2c L II 4 4, 16, 13, 19 15 N3 R I-V 3 3, 7, 20 16 N2b R II 3 4, 9, 37† 17 N2c L II/III 3 9, 6, 4 * No nodal metastases.
† Percentage measurement error was greater than 20% because of small absolute differences in the volume measurements of small lesions.
‡ Percentage measurement error was greater than 20% because of inaccuracies in the volume measurements due to patient motion.
- TABLE 3:
Percentage measurement error for primary pharyngeal cancer and regional nodal metastases
Percent Measurement Error Primary Tumor Nodal Mass Mean, % 13 9 Standard deviation, % 11 9 Median, % 12 7 95% CI, % 10,16 7,12 Range, % 0,53 0,37
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