Accession Number:

ADA455777

Title:

Enhanced ULtrasound Visualization of Brachytherapy Seeds by a Novel Magnetically Induced Motion Image Method

Descriptive Note:

Annual rept. 1 Apr 2005-31 Mar 2006

Corporate Author:

ROCHESTER UNIV NY

Personal Author(s):

• McAleavey, Stephen

Report Date:

2006-04-01

Pagination or Media Count:

16.0

Abstract:

We report our progress in developing Magnetically Induced Motion Imaging MIMI for unambiguous identification and localization brachytherapy seeds in ultrasound images. In this period we have developed finite-element models for calculating the force on a soft ferromagnetic seed core due to geometrical anisotropy and compared two candidate seed geometries to determine the sensitivity of torque to geometry. We have created a finite element model of a prototype coil configuration for seed vibration and demonstrated the ability of this coil configuration to steer the magnetic field in a manner suitable for improving MIMI imaging. We present our first 3D reconstructions of seeds embedded in a tissue-mimicking phantom the reconstructions show good agreement with previous simulations. The insensitivity of the vibration Doppler signal to ultrasound beam angle and ultrasound frequency is experimentally demonstrated.

Descriptors:

• *ULTRASONICS
• *FERROMAGNETIC MATERIALS
• *SEEDS
• MATHEMATICAL MODELS
• SIGNAL PROCESSING
• FREQUENCY
• MAGNETIC FIELDS
• ANISOTROPY
• GEOMETRY
• BEAMS(ELECTROMAGNETIC)
• DOPPLER EFFECT
• TORQUE
• CONFIGURATIONS
• VIBRATION
• STEERING
• FINITE ELEMENT ANALYSIS
• PROTOTYPES

Subject Categories:

• Medicine and Medical Research
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE