Double-row 18-loop transceive–32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T

Nikolai I. Avdievich, Ioannis Angelos Giapitzakis, Jonas Bause, Gunamony Shajan, Klaus Scheffler, Anke Henning

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Purpose: To improve the transmit (Tx) and receive (Rx) performance of a human head array and provide whole-brain coverage at 9.4T, a novel 32-element array design was developed, constructed, and tested. Methods: The array consists of 18 transceiver (TxRx) surface loops and 14 Rx-only vertical loops all placed in a single layer. The new design combines benefits of both TxRx and transmit-only–receive-only (ToRo) designs. The general idea of the design is that the total number of array elements (both TxRx and Rx) should not exceed the number of required Rx elements. First, the necessary number of TxRx loops is placed around the object tightly to optimize the Tx performance. The rest of the elements are loops, which are used only for reception. We also compared the performance of the new array with that of a state-of-the-art ToRo array consisting of 16 Tx-only loops and 31 Rx-only loops. Results: The new array provides whole-brain coverage, ~1.5 times greater Tx efficiency and 1.3 times higher SNR near the brain center as compared to the ToRo array, while the latter delivers higher (up to 1.5 times) peripheral SNR. Conclusion: In general, the new approach of constructing a single-layer array consisting of both TxRx- and Rx-only elements simplifies the array construction by minimizing the total number of elements and makes the entire design more robust and, therefore, safe. Overall, our work provides a recipe for a Tx- and Rx-efficient head array coil suitable for parallel transmission and reception as well as whole-brain imaging at UHF.

Original languageEnglish (US)
Pages (from-to)3392-3405
Number of pages14
JournalMagnetic resonance in medicine
Volume81
Issue number5
DOIs
StatePublished - May 2019
Externally publishedYes

Fingerprint

Brain
Head
Neuroimaging

Keywords

  • array optimization
  • SNR
  • transceiver arrays
  • transmit performance
  • ultra-high field MRI
  • whole-brain coverage

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Double-row 18-loop transceive–32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T. / Avdievich, Nikolai I.; Giapitzakis, Ioannis Angelos; Bause, Jonas; Shajan, Gunamony; Scheffler, Klaus; Henning, Anke.

In: Magnetic resonance in medicine, Vol. 81, No. 5, 05.2019, p. 3392-3405.

Research output: Contribution to journalArticle

Avdievich, Nikolai I. ; Giapitzakis, Ioannis Angelos ; Bause, Jonas ; Shajan, Gunamony ; Scheffler, Klaus ; Henning, Anke. / Double-row 18-loop transceive–32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T. In: Magnetic resonance in medicine. 2019 ; Vol. 81, No. 5. pp. 3392-3405.
@article{da04ad8f05d64696af165d943cf63079,
title = "Double-row 18-loop transceive–32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T",
abstract = "Purpose: To improve the transmit (Tx) and receive (Rx) performance of a human head array and provide whole-brain coverage at 9.4T, a novel 32-element array design was developed, constructed, and tested. Methods: The array consists of 18 transceiver (TxRx) surface loops and 14 Rx-only vertical loops all placed in a single layer. The new design combines benefits of both TxRx and transmit-only–receive-only (ToRo) designs. The general idea of the design is that the total number of array elements (both TxRx and Rx) should not exceed the number of required Rx elements. First, the necessary number of TxRx loops is placed around the object tightly to optimize the Tx performance. The rest of the elements are loops, which are used only for reception. We also compared the performance of the new array with that of a state-of-the-art ToRo array consisting of 16 Tx-only loops and 31 Rx-only loops. Results: The new array provides whole-brain coverage, ~1.5 times greater Tx efficiency and 1.3 times higher SNR near the brain center as compared to the ToRo array, while the latter delivers higher (up to 1.5 times) peripheral SNR. Conclusion: In general, the new approach of constructing a single-layer array consisting of both TxRx- and Rx-only elements simplifies the array construction by minimizing the total number of elements and makes the entire design more robust and, therefore, safe. Overall, our work provides a recipe for a Tx- and Rx-efficient head array coil suitable for parallel transmission and reception as well as whole-brain imaging at UHF.",
keywords = "array optimization, SNR, transceiver arrays, transmit performance, ultra-high field MRI, whole-brain coverage",
author = "Avdievich, {Nikolai I.} and Giapitzakis, {Ioannis Angelos} and Jonas Bause and Gunamony Shajan and Klaus Scheffler and Anke Henning",
year = "2019",
month = "5",
doi = "10.1002/mrm.27602",
language = "English (US)",
volume = "81",
pages = "3392--3405",
journal = "Magnetic Resonance in Medicine",
issn = "0740-3194",
publisher = "John Wiley and Sons Inc.",
number = "5",

}

TY - JOUR

T1 - Double-row 18-loop transceive–32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T

AU - Avdievich, Nikolai I.

AU - Giapitzakis, Ioannis Angelos

AU - Bause, Jonas

AU - Shajan, Gunamony

AU - Scheffler, Klaus

AU - Henning, Anke

PY - 2019/5

Y1 - 2019/5

N2 - Purpose: To improve the transmit (Tx) and receive (Rx) performance of a human head array and provide whole-brain coverage at 9.4T, a novel 32-element array design was developed, constructed, and tested. Methods: The array consists of 18 transceiver (TxRx) surface loops and 14 Rx-only vertical loops all placed in a single layer. The new design combines benefits of both TxRx and transmit-only–receive-only (ToRo) designs. The general idea of the design is that the total number of array elements (both TxRx and Rx) should not exceed the number of required Rx elements. First, the necessary number of TxRx loops is placed around the object tightly to optimize the Tx performance. The rest of the elements are loops, which are used only for reception. We also compared the performance of the new array with that of a state-of-the-art ToRo array consisting of 16 Tx-only loops and 31 Rx-only loops. Results: The new array provides whole-brain coverage, ~1.5 times greater Tx efficiency and 1.3 times higher SNR near the brain center as compared to the ToRo array, while the latter delivers higher (up to 1.5 times) peripheral SNR. Conclusion: In general, the new approach of constructing a single-layer array consisting of both TxRx- and Rx-only elements simplifies the array construction by minimizing the total number of elements and makes the entire design more robust and, therefore, safe. Overall, our work provides a recipe for a Tx- and Rx-efficient head array coil suitable for parallel transmission and reception as well as whole-brain imaging at UHF.

AB - Purpose: To improve the transmit (Tx) and receive (Rx) performance of a human head array and provide whole-brain coverage at 9.4T, a novel 32-element array design was developed, constructed, and tested. Methods: The array consists of 18 transceiver (TxRx) surface loops and 14 Rx-only vertical loops all placed in a single layer. The new design combines benefits of both TxRx and transmit-only–receive-only (ToRo) designs. The general idea of the design is that the total number of array elements (both TxRx and Rx) should not exceed the number of required Rx elements. First, the necessary number of TxRx loops is placed around the object tightly to optimize the Tx performance. The rest of the elements are loops, which are used only for reception. We also compared the performance of the new array with that of a state-of-the-art ToRo array consisting of 16 Tx-only loops and 31 Rx-only loops. Results: The new array provides whole-brain coverage, ~1.5 times greater Tx efficiency and 1.3 times higher SNR near the brain center as compared to the ToRo array, while the latter delivers higher (up to 1.5 times) peripheral SNR. Conclusion: In general, the new approach of constructing a single-layer array consisting of both TxRx- and Rx-only elements simplifies the array construction by minimizing the total number of elements and makes the entire design more robust and, therefore, safe. Overall, our work provides a recipe for a Tx- and Rx-efficient head array coil suitable for parallel transmission and reception as well as whole-brain imaging at UHF.

KW - array optimization

KW - SNR

KW - transceiver arrays

KW - transmit performance

KW - ultra-high field MRI

KW - whole-brain coverage

UR - http://www.scopus.com/inward/record.url?scp=85057948167&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057948167&partnerID=8YFLogxK

U2 - 10.1002/mrm.27602

DO - 10.1002/mrm.27602

M3 - Article

C2 - 30506725

AN - SCOPUS:85057948167

VL - 81

SP - 3392

EP - 3405

JO - Magnetic Resonance in Medicine

JF - Magnetic Resonance in Medicine

SN - 0740-3194

IS - 5

ER -