Image Reslicing

Reslice Images This mode provides orthogonal image reformatting at an arbitrary orientation. The 3D image is displayed, as a guide to orientation, together with three orthogonal slices. The positions of the slices are shown by the blue lines. The left mouse button can be used to drag the cross hairs in any of the displayed quadrants by clicking and dragging in the chosen quadrant. The images in two other quadrants will be updated as the cross hairs move.The cursor keys allow fine control as described in Interaction.

Scans are frequently slightly misaligned with respect to the patient, making it difficult to properly compare left and right sides. This option allows the slices to be displayed symmetrically by straightening the 3D image before entering this reslice mode.

A separate popup window displays the positions of the cross hairs both in image space (The centre of image is at 0,0,0 and x,y,z axes are aligned with the current view) and in the original data space( The 0,0,0 reference is at the top front left of the data with the x axis across the slice, y axis down the slice and z axis through the slices). These values are updated when the cross hairs are moved and can be explicitly set by typing in the edit box (press return to set new value). The data space values match those printed in the measurement window when placing markers. If the put to centre option is selected on a marker, this point in the data will be at the centre of the field of view in the 3D reslice images. The grey value and Hounsfield boxes display the value of the data at the position of the crosshairs. The grey value shows the interpolated value of the 8 bit grey scale (0-255) and, if there is a Hounsfield mapping table in the data header file, the Hounsfield box shows the equivalent Hounsfield number.

This button restores the cross hairs to the centre of the current field of view without moving the 3D image. This is useful if the position of the slices has become confusing.
This button moves the 3D field of view so that the current position of the cross hairs is moved to the centre of all four images. This option allows a region of interest to be centred in the view prior to resizing it for a detailed examination.
This button places a marker at the current position of the cross hairs. This marker can only be seen and measured in the measurement mode.
Clicking on this displays this help file.

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©2005-2007 Robin Richards. All rights reserved.