Description of the Table Columns
The LIDC nodule size table (List 1) is comprised of the following columns:
Title | Contents |
Subject | The digits after the last dot of the subject ID (the other part is constant and equal to 1.3.6.1.4.1.9328.50.3). |
Study | The digits after the last dot of the Study Instance UID (the other part is constant and equal to 1.3.6.1.4.1.9328.50.3). |
Roi | An arbitrary unique identifier for each physical nodule, estimated by at least one reader to be larger than 3 mm, in a study. |
Volume |
The volume computed from the median of the equivalent diameter of the volume estimates for that
nodule. This is a slightly different method than what will be used
from List 2 onwards for the aggregation of multiple size estimates as
it refers to the context of the comparison of metrics^{1}.
Each volume estimate is computed by multiplying the number of voxels
included in the nodule region by the voxel volume and the equivalent
diameter is equal to the diameter of a sphere having that volume. The units are mm^{3}. |
Eq. diam. | The equivalent diameter of the nodule, i. e. the diameter of the sphere having the same volume as the nodule estimated volume. The units of the diameter are mm. |
X loc. | The x coordinate of the nodule location, computed as the median of the center-of-mass x coordinates, where x is an integer between 0 and 511 included and it increases from left to right. |
Y loc. | The y coordinate of the nodule location, computed as the median value of the center-of-mass y coordinates, where y is an integer between 0 and 511 included and it increases from top to bottom. |
Slice No. | The slice number of the nodule location, computed as the median value of the center-of-mass z coordinates, where the slice number is an integer starting at 1. |
nodIDs | The identifier or identifiers of the nodule boundaries used for the volume estimation of that physical nodule. |
The data were downloaded around the end of 2006 (with an update in April 2009 for the subject ending in 0074) and all the subjects had their documentation processed.
- A. P. Reeves, A. M. Biancardi, T. V. Apanasovich, C. R. Meyer, H. MacMahon, E. J.R. van Beek, E. A. Kazerooni, D. Yankelevitz, M. F. McNitt-Gray, G. McLennan, S. G. Armato III, C. I. Henschke, D. R. Aberle, B. Y. Croft, and L. P. Clarke. "The lung image database consortium (LIDC): A comparison of different size metrics for pulmonary nodule measurements." Academic Radiology, 14(12):1475-1485, Dec 2007.