Casos de Implementación de gamificación

 Projection view:

There are two options for the direction of the generation of the MIP image. These are (1) horizontal – meaning in the z axis, or (2) along profile, meaning orthogonally across the direction of the currently drawn profile line.

 Background color:

Here “color” means black or white  . If the background “color” is set to the same color as the ambient background, then the image generated will be the maximum intensity projection, showing the densest structures. If the color is set to the color of the maximum density, then the process will generate instead the minimum intensity projection, revealing low density inclusions.

 Depth of projection:

This sets the number of image slices in the chosen plane that will be sampled, centered around the current crossection in the case of horizontal view and the red line in the case of “along profile” being selected. With “along profile”

selected, the depth of projection is displayed in real time as a shaded region centered along the red line.

 Number of projections:

The selected projection depth can either be sampled as a single MIP, if number of projections is set to 1 (the default value) or can be divided into a selected number of multiple slices.

When the horizontal (z axis) MIP is selected, the image will sample all the

crossection levels of the open dataset. When “along profile” is selected, a box with the title “depth” will appear in which you should enter the number of pixel slices to be sampled orthogonally to the profile line. The region thus selected for MIP imaging will be shown interactively – as in the white central band in the image below (the same as in the tool for angular reslicing – see above). Note again that the profile line can be either a default centrally placed horizontal or vertical line (as set in preferences, general tab) or a line drawn freehand in any direction and of any length. Examples of the images created by the MIP tool in the x (horizontal), y (vertical) and z (between crossections) planes, from the scan of a Microfil-infiltrated kidney, are shown below.

Setting a high value for “number of projections” allows a set of MIP slices to be taken through a selected part or all of the dataset. This can be a useful way of displaying quickly the structure of a scanned object in a limited number of MIP slices.

Kidney microCT scan: (2) Kidney microCT scan: crossection xxxxxxxxxxxxxxxxxxxxxxxMIP, X plane (along profile, horizontal)

Kidney microCT scan: (4) Kidney microCT scan: MIP, Y plane (along profile, vertical) MIP, Z plane (“horizontal”)

7.1.5. The virtual projection image

The button for projection creates a virtual projection image by forward-projection from the crossection dataset. Like the MIP function, you can choose the “projection view” between “horizontal” (i.e. operating in the axial Z plane to create a horizontal

The generated image can, again, be saved or set as the dataset spr projection image.

7.1.6. Apply or remove the ROI

The last button to the right under “profile” applies or removes the current ROI from the displayed image in the raw images page.

Note that when the ROI button is pressed and the Roi is applied, then this will apply to all the sectioning and MIP / projection imaging functions associated with the profile line. Thus MIP images, cut slice images and virtual projection images generated at this page will be restricted to the ROI if the ROI button is selected.

If this button is not selected, then the MIP images, cut slice images and virtual projection images will be made from the whole images, regardless of any ROI selection at the ROI page.

At the ROI page the ROI as shown (rotated rectangle) is applied

Back at the raw images page, the ROI button (far right) is selected, so the ROI from the ROI page is applied to the displayed crossection image in the raw images page.

7.2. The ruler and protractor tool

left mouse button on the

crossection image will activate a ruler tool which measures

straight line distance, as shown in the image to the right.

If the drag-and-drop is

accompanied by pressing CTRL on the keyboard, then a

protractor tool is activated, as shown in the image below. To use the protractor, hold down the keyboard control key and draw a line with the left mouse button pressed. Alongside the line drawn by the mouse

movement a second horizontal line will appear, and the angular segment between the drawn line (hypotenuse) and the horizontal line (adjacent) will be shown. To switch control to the other (adjacent) line, keep the left mouse button pressed and release the control key. You can switch back to the first line by pressing the control key again. The ruler and protractor are only displayed while the left mouse button is pressed.

7.3. The hand measurement tool

CT-Analyser provides a tool for manual measurement of angles, straight line distances and distances along a free-hand drawn non-straight line. The

measurements are made on both the projection and crossection images. The tool dialog is opened with the yellow protractor icon in the CTAn top button row:

The “measure” dialog has four tabs, angle, line, path and coordinate. Selecting one of these enables on-screen measurement using left mouse click or drag-and-drop.