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     MRVision has been designed for ease of use with a simple 'uncluttered' layout. More advanced image processing and synthesis features are easily accessible through menus and 'pop-up' windows, using a minimum number of mouse operations. With experience, 'macro' and 'batch mode' functions allow many complex image analysis tasks to be automated and performed repetitively on large groups of images.

     The basic MRVision window shown in A consists of an image display area beneath a simple control panel. The image display area may be subdivided to show a maximum of 128 images at once. Data from a range of sources can be displayed including magnitude, phase and real/imaginary (complex) MRI images; up to 20,000 images may be loaded at once (depending on computer memory limits). The display is customizible to display any matrix from 1 to 128 images in wither direction.
 

     Figure A. MRVision can load and display multiple images from a range of different sources. Top row: coronal sections through rat brain (small-bore MRI system). Second row: T2-weighted and Diffusion weighted brain images of a stroke patient (clinical MRI). Third row: T1-weighted knee images (clinical MRI). Fourth row: heart and liver images (high-speed clinical CT). The last CT image has been rescaled and magnified to show the soft tissue contrast. The internal 32 bits/pixel floating point representation and simple window/level adjustment insures that the full dynamic range of the data is preserved.

Basic operations of the program; displaying images, zooming (magnifying) and panning (shifting the visible part of magnified images) are controlled using the mouse inside the image display window. The single touch zoom function allows images to be magnified, interpolated and panned by simply clicking or dragging the mouse.

Images are stored internally in the program with 32bit resolution to preserve the full dynamic range of the data. Images can be interactively scaled individually or as a group, as shown in A where human and animal MRI and CT images from three different scanners are displayed together despite the widely differing pixel values. A variety of color scales and gray scales are available, as well as user defined scales. The window and level can be changed either by moving the mouse within the image display area, or using the image scaling popup window, B.

 

     Figure B.  Multislice multiecho images of a rat brain, also showing the image scaling panel which controls the window/level (brightness/contrast) settings. Window and level can also be changed interactively by dragging the mouse in the main display window. Images can also be grouped so that, for example, all the slices for a given TE value are displayed at the same window/level settings to optimize contrast at each echo time.