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Model Fitting History

The system maintains a history of model configurations for each region. All operations, which change the model configuration result in a new entry in the history list. The history is saved within a .km file and will be continued after reloading the data.

The history functionality is accessible by the user interface elements right to the model configuration

Switches to the previous model configuration in the history list.

Appends the current model configuration to the list.

Switches to the following model configuration in the list.

Shows the history window.

CAUTION: This history mechanism does not account for changes in the configuration of the blood-related models, except for the blood delay. However, it includes the definition of the residual weighting, the valid points, and the tissue TAC values.

History Window

The history list is shown in a dialog window as illustrated below.

The upper part of the Parameters panel lists the model configurations in rows. The initial columns are descriptive, followed by the actual parameters. Note that the parameters are sorted into appropriate columns even across different model types. For instance, Vt resulting from all compartment models as well as the Logan plot appears in the same column so that the values can easily can be compared. The user can change the order of the columns by dragging the column headers left or right. The smallest value per column is encoded in green, the largest in red. Columns having a constant value are encoded in blue. The No column refers to the chronology of list entry. Revision serves for grouping results from a certain task such as the parameter sensitivity analysis. Type indicates by what process the configuration was added. The list can be flexibly sorted by clicking on the column headers.

To restore a model configuration double-click the list entry or mark it in the list and activate Select. Copy to Clipboard copies the window contents, so that it can be pasted into another application for further analysis. Model configurations can be removed by selecting them in the list and activating Delete. The Clear All button

allows resetting the history completely. Close just closes the window.

Optional Elements

The window has some configuration options which can be opened as illustrated above. The elements to be changed are:

Show standard error (SE)
in table

Include a column with the % standard error for each parameter.

Show distribution statistics
in table

Enable the lower area showing the average, median and stdv per column.

Display parameters curve

Shows an additional panel for the visualizing the parameters of the selected rows as curves, as described below.

Display relative change curve

As Display parameters curve, but with normalization to the last value.

Region filter

Not applicable here.

Model filter

For filtering the entries listed. With *Comp*, for instance, only compartment model results will be listed.