DSX Definitions

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In the DSX Suite documentation there are some terms which are specific to the technology and/or programs. A list of these terms and their definitions are provided below.

     Asynchronous_X-ray_Data
X-ray data in which both views have frames of data at different times.
     Calibration_Trial
An x-ray trial used for calibrating the DSX system.
There are three types: uniformity, grid, and cube.
     Dock_Widgets
The dockable widgets allow for some flexibility in the graphical interface of most of the DSX applications.
These widgets can be made visible or hidden using the View menu.
The widgets can be dragged across the screen as a normal dialog window and can be docked in predefined loactions (normally the sides, top, or bottom) in the main window.
     Frame_Time

The time stamp for a single frame of x-ray data from a single view.

     Landmark
A point identified in the voxel data or on the surface model of an object (e.g., ligament attachment).
Once the object has been tracked in the x-ray data (using either Point_of_Interest or object tracking), the position of the landmark at the reporting times can be calculated and output.
     Motion_Trial
An x-ray trial of an activity for which you want to track objects and/or POIs.
     Object
     Subject_Object
A 3D object (e.g., bone, implant) that can be tracked in multiple motion trials.
It must have voxel data associated with it in order to be tracked in the x-ray data, and it must have a polygonal surface model with a local reference frame and regions of interest in order to be used in kinematic analyses in Visual3D.
     Tracked_Object
A subject object that is tracked in a particular motion trial or reference trial]].
Once subject objects have been created from voxel data, any subset of them can be chosen for tracking in each motion trial.
The ones chosen for a trial are that trial’s tracked objects.
Each tracked object has a link to its subject object and a pose map containing tracking data.
     Parameters
Each DSX application has its own application specific parameters that are displayed, and can be edited, in a dockable widget.
The parameter values are stored in the subject file.
     Point_of_Interest
A point of interest (POI) (usually a bead) that is tracked in x-ray data.
The point does not need to be identified in a 3D scan (e.g., CT).
However, if three or more POIs are identified in the scan data and then tracked in the x-ray data, they can then be used to calculate the pose of a 3D object (e.g., bone).
     Pose
     Pose_for_Objects
A set of 6 degrees of freedom (DOFs) that define its position and orientation.
Objects could be bones or implants.
     Pose_for_POI
Pose for Point_of_Interest
A set of 3 translations that define its position.
     Pose_Map
A temporal set of poses that are defined by a cubic spline.
     Reference_Trial
An x-ray trial that is used to help process and analyze motion trials.
They are usually static trials in which the subject is stationary.
Reference trials are needed in order to create Visual3D linked models, which are used to generate object poses from motion capture data.
     Region_of_Interest

"An ROI is a geometric primitive that is used to mark a region of the surface model of an object.

This region is used by Visual3D to calculate distance maps between the object and another object.
     Reporting_Time
A user-specified time point which is used to calculate and output tracking data.
The reporting time does not have to match a frame time in either view.
     Subject_File
All of the DSX applications use a single text file (*.xml) for holding all of the information about a single subject, which can include multiple sessions.
The subject file contains the following information:
the subject details,
the x-ray configurations,
links to all of the data files (both raw and processed), and
links to all of the results files.
Each application loads the subject file to import the information that it needs and updates the file with the results of the analyses performed.
     Synchronous_X-ray_Data
X-ray data in which both views have common frames of data.
     Temporary_Subject_File
All of the DSX applications maintain a temporary subject file while you are working.
This file is always kept-up-to-date and can be used in case of a crash.
When the user loads a subject file, each application will check to see if there is a temporary version of the file and if there is the application will ask the user which of the two files to load.
Each application has a file menu which allows the user to save the currently loaded subject file to the existing file or to a new file.
When an application is closed, it checks whether the temporary subject file has changed since the last save and, if so, asks the user to save or discard the changes.
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