書誌事項
- タイトル別名
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- Fundamental Evaluation of Wavelet Transform Based Noise Reduction Using Soft Threshold Method in Single Photon Emission Computed Tomography Image
- SPECT ガゾウ ニ タイスル Soft Thresholdホウ オ モチイタ ウェーブレット ヘンカン ノイズ ヨクセイ ショリ ノ ヒョウカ
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Purpose: The wavelet transform is a newly developed signal-processing tool that decomposes a signal into various levels of resolution. The wavelet transform based noise reduction has the characteristics of optimally separating signal from noise, preserving the rapid rises and falls of a signal, and reconstructing a smooth signal from noise-imposed observations. The aim of this study was to evaluate the effects of applying a new noise reduction technique, the wavelet transform based noise reduction, to single photon emission computed tomography (SPECT) images. Methods: Three experiments were performed using cylindrical phantom, line source, and hot-rod phantom, respectively. We acquired SPECT image datasets of each phantom, and reconstructed SPECT images using the wavelet transform based noise reduction with filter back projection (FBP). Images were de-noised by 3 parameters of wavelet transform based noise reduction: 1st wavelet weight (WW), 2nd WW, and 3rd WW, respectively. We evaluated the variances of full width at half maximum (FWHM), coefficients of variation (%CV), and frequency domains (radius direction distribution function in the power spectrum), respectively. Results: In the cylindrical phantom test, %CV was reduced from 27.92% to 15.38% using the wavelet approach. On the other hand, FWHM values showed no significant change. However, the increases of wavelet weights caused artifacts on the reconstructed images in some cases. Conclusions: The wavelet based noise reduction had the significant potential to improve SPECT image. Therefore, the wavelet method should prove to be a robust approach to improve image quantification and fidelity.
収録刊行物
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- 日本放射線技術学会雑誌
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日本放射線技術学会雑誌 69 (1), 49-57, 2013
公益社団法人 日本放射線技術学会
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詳細情報 詳細情報について
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- CRID
- 1390282681337817728
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- NII論文ID
- 10031139909
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- NII書誌ID
- AN00197784
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- COI
- 1:STN:280:DC%2BC3szjt1yksA%3D%3D
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- ISSN
- 18814883
- 03694305
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- NDL書誌ID
- 024270216
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- PubMed
- 23358338
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 使用不可