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It was discovered that quaternion can be used in surgery navigation system (SNS), as an alternative and compact way to represent rotations. Coordinates conversion must be included when localizing in different coordinate. The application of quaternion in SNS coordinates conversion and the application of space registration in SNS are theoretically introduced in detail. The result of simulation shows...
In this paper, we propose a computer simulated biopsy marking (CSBM) system for gastroscopy physicians. The purpose of the study is to solve two problems: how to mark suspicious areas for follow-ups without hurting stomach, and how to cut down time spent on gastroscopy. By constructing a three-dimensional (3D) virtual stomach model and using a tracking device, the position of gastroscope is shown...
Robust field map estimation is important to many MRI applications, such as reconstruction with correction of susceptibility artifacts, MR-based temperature mapping, and water-fat separation. To enable in-vivo field map estimation with minimal scan times, multi-echo imaging sequences, which acquire multiple images in a single repetition, are gaining great interest. However, it has been observed that...
The progressive image transmission (PIT) technique has been used to alleviate the communication problem related to transmit large volume of medical image data. In this study, we propose a novel PIT algorithm based on wavelet transform, DPCM coding and non-uniform scalar quantization. Experimental results have confirmed the efficiency of the proposed scheme. The achieved bit rate for the first recognizable...
The progressive image transmission (PIT) technique has been used to alleviate the communication problem related to transmit large volume of medical image data. In this study, we propose a novel PIT algorithm based on wavelet transform, DPCM coding and non-uniform scalar quantization. Experimental results have confirmed the efficiency of the proposed scheme. The achieved bit rate for the first recognizable...
A high frequency contrast-assisted destruction/reperfusion imaging system has been developed to improve image resolution in previous study. Our goal in this work is to build a fast and robust algorithm to evaluate volumetric microcirculation blood flow. The microcirculation flow rate is determined by the multiplication of perfusion area and corresponding blood flow velocity mapping. The blood flow...
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