Multi element synthetic aperture transmission using a frequency division approach

Fredrik Gran; Jørgen Arendt Jensen

doi:10.1109/ULTSYM.2003.1293297

Multi element synthetic aperture transmission using a frequency division approach

Fredrik Gran, Jørgen Arendt Jensen

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Abstract

In synthetic aperture imaging an image is created by a number of single element defocused emissions. A low resolution image is created after every emission and a high resolution image is formed when the entire aperture has been covered. Since only one element is used at a time the energy transmitted into the tissue is low. This paper describes a novel method in which the available spectrum is divided into 2N overlapping subbands. This will assure a smooth broadband high resolution spectrum when combined. The signals are grouped into two subsets in which all signals are fully orthogonal. The transmitting elements are excited so that N virtual sources are formed. All sources are excited using one subset at a time. The signals can be separated by matched filtration, and the corresponding information is extracted. The individual source information is hence available in every emission and the method can therefore be used for flow imaging, unlike with Hadamard and Golay coding. The frequency division approach increases the SNR by a factor of N2 compared to conventional pulsed synthetic aperture imaging, provided that N transmission centers are used. Simulations and phantom measurements are presented to verify the method.

Original language	English
Title of host publication	IEEE Symposium on Ultrasonics, 2003
Volume	2
Publisher	IEEE
Publication date	2003
Pages	1942-1946
ISBN (Print)	0-7803-7922-5
DOIs	https://doi.org/10.1109/ULTSYM.2003.1293297
Publication status	Published - 2003
Event	2003 IEEE Ultrasonics Symposium - Honolulu, United States Duration: 5 Oct 2003 → 8 Oct 2003 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=9075

Conference

Conference	2003 IEEE Ultrasonics Symposium
Country/Territory	United States
City	Honolulu
Period	05/10/2003 → 08/10/2003
Internet address	http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=9075

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Copyright: 2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "Multi element synthetic aperture transmission using a frequency division approach",

abstract = "In synthetic aperture imaging an image is created by a number of single element defocused emissions. A low resolution image is created after every emission and a high resolution image is formed when the entire aperture has been covered. Since only one element is used at a time the energy transmitted into the tissue is low. This paper describes a novel method in which the available spectrum is divided into 2N overlapping subbands. This will assure a smooth broadband high resolution spectrum when combined. The signals are grouped into two subsets in which all signals are fully orthogonal. The transmitting elements are excited so that N virtual sources are formed. All sources are excited using one subset at a time. The signals can be separated by matched filtration, and the corresponding information is extracted. The individual source information is hence available in every emission and the method can therefore be used for flow imaging, unlike with Hadamard and Golay coding. The frequency division approach increases the SNR by a factor of N2 compared to conventional pulsed synthetic aperture imaging, provided that N transmission centers are used. Simulations and phantom measurements are presented to verify the method.",

author = "Fredrik Gran and Jensen, {J{\o}rgen Arendt}",

note = "Copyright: 2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE; 2003 IEEE Ultrasonics Symposium, IUS 2003 ; Conference date: 05-10-2003 Through 08-10-2003",

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AU - Jensen, Jørgen Arendt

N1 - Copyright: 2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

PY - 2003

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N2 - In synthetic aperture imaging an image is created by a number of single element defocused emissions. A low resolution image is created after every emission and a high resolution image is formed when the entire aperture has been covered. Since only one element is used at a time the energy transmitted into the tissue is low. This paper describes a novel method in which the available spectrum is divided into 2N overlapping subbands. This will assure a smooth broadband high resolution spectrum when combined. The signals are grouped into two subsets in which all signals are fully orthogonal. The transmitting elements are excited so that N virtual sources are formed. All sources are excited using one subset at a time. The signals can be separated by matched filtration, and the corresponding information is extracted. The individual source information is hence available in every emission and the method can therefore be used for flow imaging, unlike with Hadamard and Golay coding. The frequency division approach increases the SNR by a factor of N2 compared to conventional pulsed synthetic aperture imaging, provided that N transmission centers are used. Simulations and phantom measurements are presented to verify the method.

AB - In synthetic aperture imaging an image is created by a number of single element defocused emissions. A low resolution image is created after every emission and a high resolution image is formed when the entire aperture has been covered. Since only one element is used at a time the energy transmitted into the tissue is low. This paper describes a novel method in which the available spectrum is divided into 2N overlapping subbands. This will assure a smooth broadband high resolution spectrum when combined. The signals are grouped into two subsets in which all signals are fully orthogonal. The transmitting elements are excited so that N virtual sources are formed. All sources are excited using one subset at a time. The signals can be separated by matched filtration, and the corresponding information is extracted. The individual source information is hence available in every emission and the method can therefore be used for flow imaging, unlike with Hadamard and Golay coding. The frequency division approach increases the SNR by a factor of N2 compared to conventional pulsed synthetic aperture imaging, provided that N transmission centers are used. Simulations and phantom measurements are presented to verify the method.

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DO - 10.1109/ULTSYM.2003.1293297

M3 - Article in proceedings

SN - 0-7803-7922-5

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EP - 1946

BT - IEEE Symposium on Ultrasonics, 2003

PB - IEEE

T2 - 2003 IEEE Ultrasonics Symposium

Y2 - 5 October 2003 through 8 October 2003

ER -

Multi element synthetic aperture transmission using a frequency division approach

Abstract

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