Volume Mode
11.6 VOCAL
General Information
The VOCAL™ - Imaging program (Virtual Organ Computer-aided AnaLysis) is integrated in GE
Medical System - Kretztechnik's Voluson® 730Pro sonography system. It opens up completely new
possibilities in cancer diagnosis, therapy planning and follow-up therapy control.
VOCAL™ offers different functions:
• Manual Contour detection of structures (such as tumor lesion, cyst, prostate etc.) and subsequent
volume calculation. The accuracy of the process can be visually controlled by the examiner in
multi-planar display.
• Construction of a virtual shell around the contour of the lesion. The wall thickness of the shell can
be defined. The shell can be imagined as a layer of tissue around the lesion, where the tumor
vascularization takes place.
• Automatic calculation of the vascularization within the shell by 3D color histogram by comparing
the number of color voxels to the number of grayscale voxels.
The follow-up control of tumor volume and vascularization delivers information on the proper
dose of medication or radiation and is therefore a measure for the success of treatment.
After definition of a contour in 3D space a wide range of functionality is given:
• definition of a shell contour
• visualization of a (shell) contour as a surface or wire mesh
• volume calculation of a (shell) contour
• histogram calculation of ultrasound tissue inside a (shell) contour
• visualization of ultrasound tissue inside a (shell) contour as a rendered image
• niche presentation of contour and slices
• cine rotation calculation
The basic idea behind VOCAL™ is the combination of 3D ultrasound tissue (presented as voxels) and
the geometric information of surfaces in a 3D dataset.
The main interest of VOCAL™ is the volume calculation of tumors or lesions.
The principle operation steps are given in this diagram.
Voluson
®
730Pro - Basic User Manual
11-64 105831 Rev. 0
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