Measurement of organ volume using three dimensional ultrasound
Hughes, Stephen W. (1997) Measurement of organ volume using three dimensional ultrasound. PhD thesis, King's College London.
A system has been developed for calculating volume from a sequence of multiplanar two dimensional ultrasound images. Ultrasound image capture is via a video digitising card installed in a personal computer. Regions of interest are transformed from 2D image space to 3D space using position and orientation data obtained from an electromagnetic device (Fastrak, Polhemus Inc, VT) attached to the ultrasound probe. The accuracy of the system was assessed by scanning 10 water filled balloons (13 - 141 ml), 10 kidneys (147 - 200 ml) and 16 fetal livers (8 - 37 ml) immersed in water using an Acuson 128XP/10 (5 MHz curvilinear probe). Volume was calculated using the ellipsoid and planimetry methods, two tetrahedral methods, and two integral methods - a ray tracing algorithm and one based on Gauss’ theorem. Actual volume was estimated by weighing (balloons) and water displacement (kidneys and livers). The mean percentage error (± one standard deviation) for the ray tracing algorithm was 0.9 ± 2.4%, 2.7 ± 2.3%, 6.6 ± 5.4% for balloons, kidneys and livers respectively. Four sets of 10 kidneys were scanned using three scan techniques on four different ultrasound machines of varying image quality. There was no significant difference between scan techniques or machines. Twelve of the 16 fetal livers were scanned by computed tomography and magnetic resonance. The mean percentage errors were 5.3 ± 4.7%, -3.1 ± 9.6%, -0.03 ± 9.7 for ultrasound (radial scans, ray volumes), magnetic resonance and X-ray computed tomography (voxel counting) respectively. Tests carried out on the Fastrak showed that it is suitable for use in a clinical environment if care is exercised. These in vitro studies suggest that the system has the potential to be a useful tool in measuring organ volume in vivo.
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|Item Type:||Thesis (PhD)|
|Keywords:||three dimensional, 3D, ultrasound, organ volume, 3D tracker|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Schools > School of Physical & Chemical Sciences
|Institution:||King's College London|
|Copyright Owner:||Copyright 1997 Hughes, Stephen|
|Deposited On:||12 Dec 2008 12:04|
|Last Modified:||09 Jun 2010 23:14|
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