John Thompson crossed modality FROC dataset

This is a crossed modality dataset, see book Section 18.5. There are two modality factors. The first modality factor modalityID1 can be "F" or "I", which represent two CT reconstruction algorithms. The second modality factor modalityID2 can be "20" "40" "60" "80", which represent the mAs values of the image acquisition. The factors are fully crossed.

datasetX

Format

A list with 3 elements: $ratings, $lesions and $descriptions; $ratings contain 3 elements, $NL, $LL and $LL_IL as sub-lists; $lesions contain 3 elements, $perCase, $IDs and $weights as sub-lists; $descriptions contain 7 elements, $fileName, $type, $name, $truthTableStr, $design, $modalityID and $readerID as sub-lists;

  • rating$NL, num [1:2, 1:4, 1:11, 1:68, 1:5], ratings of non-lesion localizations, NLs

  • rating$LL, num [1:2, 1:4, 1:11, 1:34, 1:3], ratings of lesion localizations, LLs

  • rating$LL_ILNA, this placeholder is used only for LROC data

  • lesions$perCase, int [1:34], number of lesions per diseased case

  • lesions$IDs, num [1:34, 1:3] , numeric labels of lesions on diseased cases

  • lesions$weights, num [1:34, 1:3], weights (or clinical importances) of lesions

  • descriptions$fileName, chr, "datasetX", base name of dataset in `data` folder

  • descriptions$type, chr "FROC", the data type

  • descriptions$name, chr "THOMPSON-X-MOD", the name of the dataset

  • descriptions$truthTableStr, NA, truth table structure

  • descriptions$design, chr "FCTRL-X-MOD", study design, factorial dataset

  • descriptions$modalityID, chr [1:2] "F" "I", modality label(s)

  • descriptions$readerID, chr [1:4] "20" "40" "60" "80", reader labels

References

Thompson JD, Chakraborty DP, et al. (2016) Effect of reconstruction methods and x-ray tube current-time product on nodule detection in an anthropomorphic thorax phantom: a crossed-modality JAFROC observer study. Medical Physics. 43(3):1265-1274.

Examples

res <- str(datasetX)
#> List of 3
#>  $ ratings     :List of 3
#>   ..$ NL   : num [1:2, 1:4, 1:11, 1:68, 1:5] -Inf -Inf -Inf -Inf -Inf ...
#>   ..$ LL   : num [1:2, 1:4, 1:11, 1:34, 1:3] -Inf 1 2 8 7 ...
#>   ..$ LL_IL: logi NA
#>  $ lesions     :List of 3
#>   ..$ perCase: int [1:34] 1 2 1 1 1 1 2 2 1 1 ...
#>   ..$ IDs    : num [1:34, 1:3] 1 1 1 1 1 1 1 1 1 1 ...
#>   ..$ weights: num [1:34, 1:3] 1 0.5 1 1 1 1 0.5 0.5 1 1 ...
#>  $ descriptions:List of 8
#>   ..$ fileName     : chr "DfReadXModalities(XModDataFile)"
#>   ..$ type         : chr "FROC"
#>   ..$ name         : chr "THOMPSON-X-MOD"
#>   ..$ truthTableStr: logi NA
#>   ..$ design       : chr "FCTRL-X-MOD"
#>   ..$ modalityID1  : Named chr [1:2] "F" "I"
#>   .. ..- attr(*, "names")= chr [1:2] "F" "I"
#>   ..$ modalityID2  : Named chr [1:4] "20" "40" "60" "80"
#>   .. ..- attr(*, "names")= chr [1:4] "20" "40" "60" "80"
#>   ..$ readerID     : Named chr [1:11] "1" "2" "3" "4" ...
#>   .. ..- attr(*, "names")= chr [1:11] "1" "2" "3" "4" ...