datasetX.Rd
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
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 Array[1:2, 1:4, 1:11, 1:68, 1:5] ratings of non-lesion localizations NLs
rating$LL
num Array[1:2, 1:4, 1:11, 1:34, 1:3] ratings of lesion localizations LLs
rating$LL_IL
NA This placeholder is used only for LROC data
lesions$perCase
int Array[1:34], number of lesions per diseased case
lesions$IDs
num Array[1:34, 1:3] , numeric labels of lesions on diseased cases
lesions$weights
num Array[1:34, 1:3], weights (or clinical importance) of lesions
descriptions$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$modalityID
chr Array[1:2] "F" "I", modality label(s)
descriptions$readerID
chr Array[1:4] "20" "40" "60" "80", reader labels
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.
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" ...