The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Dalam Chirp-Pulse Microwave Computed Tomography (CP-MCT) imej dipengaruhi oleh kabur yang wujud pada prinsip pengukuran dan diterangkan oleh Fungsi Spread Titik (PSF) varian ruang. Dalam makalah ini kami menyiasat PSF CP-MCT termasuk pergantungan ruang secara eksperimen dan pengiraan. Penilaian eksperimen dilakukan dengan mengukur unjuran sasaran yang terdiri daripada rod dielektrik kehilangan rendah nipis yang dikelilingi oleh larutan garam dan diletakkan pada pelbagai kedudukan di kawasan pengukur. Sebaliknya, penilaian teori diperolehi dengan mengira unjuran sasaran yang sama melalui penyelesaian berangka persamaan Maxwell. Oleh kerana CP-MCT menggunakan isyarat kicauan, penilaian berangka dijalankan dengan menggunakan kaedah FD-TD. Unjuran rod boleh diperolehi dengan mengira medan semasa masa sapuan isyarat kicauan untuk setiap kedudukan antena penerima. Memandangkan prosedur ini sangat memakan masa, kami mengira fungsi tindak balas impuls sistem dengan mengujakan antena pemancar dengan nadi Gaussian jalur lebar. Kemudian isyarat yang dihantar dalam CP-MCT diperoleh dengan mengira produk lilitan dalam domain masa bagi nadi kicauan input dengan fungsi tindak balas impuls sistem. Kami mendapati persetujuan yang baik antara PSF yang diukur dan dikira. Rasionaliti PSF yang dikira disahkan melalui tiga cara yang berbeza dan kegunaan fungsi ini ditunjukkan oleh kesan yang luar biasa dalam pemulihan imej CP-MCT. Pengetahuan tentang PSF varian ruang akan digunakan untuk penyahkaburan imej yang lebih tepat dalam CP-MCT.
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Salinan
Michio MIYAKAWA, Kentaroh ORIKASA, Mario BERTERO, "Evaluation of the Response Function and Its Space Dependence in Chirp Pulse Microwave Computed Tomography (CP-MCT)" in IEICE TRANSACTIONS on Information,
vol. E85-D, no. 1, pp. 52-59, January 2002, doi: .
Abstract: In Chirp-Pulse Microwave Computed Tomography (CP-MCT) the images are affected by the blur which is inherent to the measurement principle and is described by a space-variant Point Spread Function (PSF). In this paper we investigate the PSF of CP-MCT including the space dependence both experimentally and computationally. The experimental evaluation is performed by measuring the projections of a target consisting of a thin low-loss dielectric rod surrounded by a saline solution and placed at various positions in the measuring region. On the other hand, the theoretical evaluation is obtained by computing the projections of the same target via a numerical solution of Maxwell's equations. Since CP-MCT uses a chirp signal, the numerical evaluation is carried out by the use of a FD-TD method. The projections of the rod could be obtained by computing the field during the sweep time of the chirp signal for each position of the receiving antenna. Since this procedure is extremely time consuming, we compute the impulse response function of the system by exciting the transmitting antenna with a wide-band Gaussian pulse. Then the signal transmitted in CP-MCT is obtained by computing the convolution product in time domain of the input chirp pulse with the impulse response function of the system. We find a good agreement between measured and computed PSF. The rationality of the computed PSF is verified by three distinct ways and the usefulness of this function is shown by a remarkable effect in the restoration of CP-MCT images. Knowledge on the space-variant PSF will be utilized for more accurate image deblurring in CP-MCT.
URL: https://global.ieice.org/en_transactions/information/10.1587/e85-d_1_52/_p
Salinan
@ARTICLE{e85-d_1_52,
author={Michio MIYAKAWA, Kentaroh ORIKASA, Mario BERTERO, },
journal={IEICE TRANSACTIONS on Information},
title={Evaluation of the Response Function and Its Space Dependence in Chirp Pulse Microwave Computed Tomography (CP-MCT)},
year={2002},
volume={E85-D},
number={1},
pages={52-59},
abstract={In Chirp-Pulse Microwave Computed Tomography (CP-MCT) the images are affected by the blur which is inherent to the measurement principle and is described by a space-variant Point Spread Function (PSF). In this paper we investigate the PSF of CP-MCT including the space dependence both experimentally and computationally. The experimental evaluation is performed by measuring the projections of a target consisting of a thin low-loss dielectric rod surrounded by a saline solution and placed at various positions in the measuring region. On the other hand, the theoretical evaluation is obtained by computing the projections of the same target via a numerical solution of Maxwell's equations. Since CP-MCT uses a chirp signal, the numerical evaluation is carried out by the use of a FD-TD method. The projections of the rod could be obtained by computing the field during the sweep time of the chirp signal for each position of the receiving antenna. Since this procedure is extremely time consuming, we compute the impulse response function of the system by exciting the transmitting antenna with a wide-band Gaussian pulse. Then the signal transmitted in CP-MCT is obtained by computing the convolution product in time domain of the input chirp pulse with the impulse response function of the system. We find a good agreement between measured and computed PSF. The rationality of the computed PSF is verified by three distinct ways and the usefulness of this function is shown by a remarkable effect in the restoration of CP-MCT images. Knowledge on the space-variant PSF will be utilized for more accurate image deblurring in CP-MCT.},
keywords={},
doi={},
ISSN={},
month={January},}
Salinan
TY - JOUR
TI - Evaluation of the Response Function and Its Space Dependence in Chirp Pulse Microwave Computed Tomography (CP-MCT)
T2 - IEICE TRANSACTIONS on Information
SP - 52
EP - 59
AU - Michio MIYAKAWA
AU - Kentaroh ORIKASA
AU - Mario BERTERO
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E85-D
IS - 1
JA - IEICE TRANSACTIONS on Information
Y1 - January 2002
AB - In Chirp-Pulse Microwave Computed Tomography (CP-MCT) the images are affected by the blur which is inherent to the measurement principle and is described by a space-variant Point Spread Function (PSF). In this paper we investigate the PSF of CP-MCT including the space dependence both experimentally and computationally. The experimental evaluation is performed by measuring the projections of a target consisting of a thin low-loss dielectric rod surrounded by a saline solution and placed at various positions in the measuring region. On the other hand, the theoretical evaluation is obtained by computing the projections of the same target via a numerical solution of Maxwell's equations. Since CP-MCT uses a chirp signal, the numerical evaluation is carried out by the use of a FD-TD method. The projections of the rod could be obtained by computing the field during the sweep time of the chirp signal for each position of the receiving antenna. Since this procedure is extremely time consuming, we compute the impulse response function of the system by exciting the transmitting antenna with a wide-band Gaussian pulse. Then the signal transmitted in CP-MCT is obtained by computing the convolution product in time domain of the input chirp pulse with the impulse response function of the system. We find a good agreement between measured and computed PSF. The rationality of the computed PSF is verified by three distinct ways and the usefulness of this function is shown by a remarkable effect in the restoration of CP-MCT images. Knowledge on the space-variant PSF will be utilized for more accurate image deblurring in CP-MCT.
ER -