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3.15. Evaluation of a general dynamic study

The program is used for simple standardized evaluation of those dynamic (functional) studies for which the relevant comprehensive programs are not available .

The evaluation of a general dynamic study usually consists of five stages:

• Study specification and selection of a summed sequence of images to display the dynamics of the investigated process.
• Visual evaluation of the distribution of the radio indicator in individual phases of the dynamics of the studied process.
• Designation of areas of interest and creation of time course curves of radio indicator distribution in corresponding places.
• Simple mathematical processing of curves in order to quantify the dynamics of the investigated process.
• You creation and printing of final protocol comprising an image of the curve, eventually. quantitative values ??and verbal evaluation, including conclusion.

Study evaluation

After calling up the required scintigraphic study *) in the basic menu PROCESSING, we will start the complex program GENDYN - general dynamic study . At the request of the program, we will insert the name of the scintigraphic study - it will then be listed in the header of the resulting protocol.
*) As with other evaluations, several scintigraphic studies can be called up, concatenated and simultaneously evaluated using the "Next" command.

Sequence and summation of images, visual evaluation

Not all images of a dynamic study would normally fit on a screen of a reasonable size. It is therefore necessary to specify a suitable summation of individual images for the sequence of displayed images . We specify the summation of the frames by specifying the time intervals for which the dynamic sdudie frames will be summed. These images are then summed and displayed on the screen together with the corresponding time interval.

If we have displayed images with the corresponding assignment of time intervals, the visual evaluation begins , and we can use both the implicit standard formulations of the normal or pathological evaluation selected from the disk and the non-standard free text.

Marking ROI and evaluation of curves

If we want to assess in more detail the dynamics of the radio indicator distribution during the investigated process, we will gradually mark the areas of interest from the images, from which the program will create curves of the time course of the radio indicator distribution in the corresponding places of the investigated object. Each ROI can be given a name, which will then describe the corresponding curve in the protocol.

For simple processing with the GENDYN program, we evaluate the curves mostly visually - in the box below we edit and insert the text of the verbal evaluation.
However, in future versions of the program, we plan to create the possibility of simple mathematical quantification of curves (growth gradients, excretion half-lives, integrals and derivatives of curves, etc.).

Final protocol

The display shows a sequence of summed images with the indicated time intervals and curves of the time course of the radio indicator distribution during the dynamic study with the marked time axis (the curves are color-coded and have the ROI names from which they come). In the box below we can edit the text of the verbal description of scintigraphic images and curves, including the conclusion. Finally, we can print a report containing (in addition to basic data such as the patient's name) the relevant images, curves, kv and ntitative data on the dynamics of the radio indicator, the text of the verbal evaluation, conclusion and signature - Fig.3.15.1.

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