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MIST Oblique

MIST Oblique is used for 3D reconstruction.

Images from one selected series are used for three-dimensional reconstruction. To perform a 3D reconstruction, load any image in the series into the selected viewport and press MIST Oblique from the MPR drop-down menu. The system divides the viewing area into four parts and starts the loading of the series of images and the image reconstruction process.

Figure 34. MPR MIST Oblique 3D indicator of the reconstruction process

The image data of the original series is converted to a spatial image. After the reconstruction process, parts of the viewport display the 3D image and slices of the transformed images in three perpendicular planes.

NOTE! The system can be set to not generate a 3D image. In the case of such a system configuration, only sections of the transformed images in three perpendicular planes are visible in the result.

 

Figure 35. The reconstruction result of MPR MIST Oblique 

Series of transformed images are displayed in the main anatomical planes: axial, coronal and sagittal.

  • The first viewport (first row left column) shows a series of transformed images in the axial plane. The axial plane is indicated by a red square in the upper right corner of the viewport.
  • The second viewport (first row right column) shows a series of transformed images in the coronal plane. The coronal plane is indicated by the blue square in the upper right corner of the viewport.
  • The third viewport (first row right column) shows a series of transformed images in the sagittal plane. The sagittal plane is indicated by the green square in the upper right corner of the viewport.

Figure 36. The Scheme of planes of transformed images

The anatomical direction of the transformed images in the viewing area is from left to right and from top to bottom:

  • axial plane series images are displayed in the direction from R (left) to L (right) and from A (top) to P (bottom).
  • coronal plane serial images are displayed in the direction from R (left) to L (right) and from S (top) to I (bottom).
  • the sagittal plane serial images are shown in the direction from A (left) to P (right) and from S (top) to I (bottom).

The lower right corner of each plane image shows the thickness of the slice used for image preparation in millimeters and the method of image preparation.

Figure 37. The thickness of the section used for image preparation in millimeters and the method of image preparation

Slice thickness by default is 0.01 mm.

The slice thickness can be changed:

  1. selecting the thickness value from the list.
  2. by moving the cursor in the scroll bar

Figure 38. Changing the slice thickness

The image preparation method can be changed by selecting a value from the drop-down list.

Figure 39. Changing the image preparation method

The values:

  • MIP (Maximum Intensity Projection): the pixel of the generated image is assigned the maximum value from the images (layers) entering the section.
  • AVG (Average Intensity Projection): the pixel of the generated image is assigned an average value calculated from the images (layers) entering the section.
  • MinIP (Minimum Intensity Projection): the pixel of the generated image is assigned the smallest value from the images (layers) entering the slice.

 

Actions with transformed images

 

To rotate the intersecting planes:

  • place the mouse cursor on any axis rotation element - a circle.
  • press the left mouse button.
  • While holding the button down, rotate the axis around the center point.

Figure 40. Rotation of intersecting planes

NOTE! When the user rotates the intersecting planes in one of the transformed image slices, the system rotates the other two slice images.

NOTE! As the plane is rotated, the system automatically updates the anatomical direction indicators displayed in the view areas of the rotated planes, which can be used to judge the direction of the cut in the patient's body.

 

To scroll along the intersecting planes:

  • place the mouse cursor on the axis line in the selected section view.
  • press the left mouse button,
  • scroll the axis while holding the button down.

Figure 41. Longitudinal displacement of intersecting planes

NOTE! As the user longitudinally scrolls the intersecting planes in one of the transformed image slices, the system scrolls the images in the other two planes.

NOTE! The action can be performed after the axes have been rotated. Then you don't scroll up/down or left / right, but diagonally, depending on how the rotation was done.

 

Carry intersecting planes:

  • place the mouse cursor on the intersection center of the axis lines in the selected section view.

NOTE! The center of intersection of the axes is not visible. Move the mouse out of the eye to estimate where the center point might be. If the exact center is not hit, the system moves the intersecting planes so that the center is where the mouse was clicked.

 

Figure 42. The center point of the intersecting planes

 

  • press the left mouse button,
  • the system redraws the axes so that the point of intersection is visible,
  • hold down the button and drag the intersecting planes in any direction.

 

Figure 43. To carry the intersecting planes

NOTE! As the user moves the intersecting planes in one of the slices of the transformed images, the system scrolls the images in the other two planes.

 

Actions can be performed by selecting an action button in the viewport.

Figure 44. Action buttons in the viewport

The action converts the content of the viewport to png format and copies it to the clipboard. After copying, the clipboard image can be pasted into any resource that supports the png format.

The action converts the copied content of the viewport to a DICOM sub-input file and saves it to the PACS.

For a detailed description of actions and , see the section Copy viewport content.

 

Show/hide axes. To hide the axes of transformed images, select . After the action, the button icon will change to white .

If the axes are not visible, selecting makes the axes visible.

Figure 45. Show/hide axes

NOTE! There is no action in the transformed spatial 3D view.

NOTE! Selecting an action on any axial slice plane of the transformed image shows or hides the axes in all three planes: axial, coronal, and sagittal.

 

To center the axes. To see the transformed axial sections centered, to see the axial lines passing through the centers of the images, select . 

Figure 46. To center Axis

NOTE! There is no action in the transformed spatial 3D view.

NOTE! Selecting an action on any axial slice plane of the transformed image centers the axes in all three planes: axial, coronal, and sagittal.

NOTE! If the axes of the transformed images have been rotated, the Center Axis action does not restore the rotation.

 

Restore the original image. After completing the actions with the axial sections of the transformed images, select . The system will reset the images to their original state.

 

Figure 47. Action of restoring the original image

 

 

NOTE! Selecting an action in any axial slice plane of the transformed image restores images in all three planes: axial, coronal, and sagittal.

NOTE! Action is also in the transformed spatial 3D image viewer. This action button works separately from the axial section view buttons.

 

To Change the layout of transformed images in the viewport, press . The system displays a list of possible image layout values.

Figure 48. The list of values for the layout of transformed images

NOTE! After changing the layout of the images, the icon of the action button changes to the icon of the selected layout, e.g., .

 

The layout is applied when opening the transformed image. The MIST Oblique layout divides the field of view into four equal sections, three showing axial, coronal, and sagittal sections, and the fourth a three-dimensional view.

Layouts represent axial, coronal, and sagittal sections, and do not represent a three-dimensional image. The order of arrangement of axial sections can be changed by selecting .

The layout shows axial, coronal, and sagittal slices, in the right part of the MIST viewing window shows a three-dimensional view.

When selected , only the 3D spatial image is displayed. Axial views of the sections are not depicted.

When selected , the active image is magnified over the entire MIST Oblique viewport.

 

Implemented the possibility to perform actions with transformed series of images and with formed spatial image, the buttons of which are available in the menu bar.

The images of the transformed axial it is possible: to change Windowing level, to move, to zoom in, etc.

Figure 49. Menu options for actions that can be performed on axial, coronal, and sagittal images

NOTE! The actions that are selected in the menu bar are different when one of the slice views and the 3D view are active. Actions Measure and Fusion can only be performed in axial, coronal and sagittal planes.

 

The possibility to perform additional actions with the formed spatial 3D image has been implemented.

Figure 50. The menu selects actions that can be performed with the formed spatial image 

 

Compared to menu actions for slice views, the 3D view has a Rotate action . Selecting an action allows you to rotate the 3D image in all directions. When rotating the spatial image, the system automatically updates the anatomical direction indicators displayed in the viewing areas of the rotated planes, which can be used to judge the direction of the incision in the patient's body.

Figure 51. Rotation of the spatial image

It is possible to change the Windowing level by selecting an action in the menu. It is described in detail in the Windowing section.

In the lower right corner of the spatial 3D image viewing window, it is possible to select programmed Windowing level presets.

Figure 52. Selection of expected Windowing levels in a spatial 3D image

NOTE! After selecting default 3D Windowing levels, the default values can be adjusted by selecting an action .

 

Figure 53. Changing the Windowing level after selecting the default value

After performing operations on transformed images, it is possible to switch to another viewing area of the application window, change the layout of the application window, create additional viewing areas, open images of the same study or another study in them and perform the desired actions on them, including transformation of images of another primary series MIST Oblique in another viewport.

Figure 54. Additional Areas of Review 

NOTE! Menu actions not described in this section work the same as opening an untransformed image in the viewport. Detailed descriptions of the actions in other sections of the document.

 

The reconstruction action MIST Oblique can be initiated with shortcut. By system value by default, the shortcut is Shift + Q.

This value of shortcut can be changed. For more information see in chapter "Shortcuts".

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