OBJECTIVE: The purpose of this study was to develop a high-resolution, near-field-optimized 14-MHz, 24-element broad-bandwidth forward-looking array for integration on a steerable 9F electrophysiology (EP) catheter. METHODS: Several generations of prototype imaging catheters with bidirectional steering, termed microlinear (ML), were built and tested as integrated catheter designs with EP sensing electrodes near the tip. The wide-bandwidth ultrasound array was mounted on the very tip, equipped with an aperture of only 1.2 by 1.58 mm. The array pulse echo performance was fully simulated, and its construction offered shielding from ablation noise. Both ex vivo and in vivo imaging with a porcine animal model were performed. RESULTS: The array pulse echo performance was concordant with Krimholtz-Leedom-Matthaei model simulation. Three generations of prototype devices were tested in the right atrium and ventricle in 4 acute pig studies for the following characteristics: (1) image quality, (2) anatomic identification, (3) visualization of other catheter devices, and (4) for a mechanism for stabilization when imaging ablation. The ML catheter is capable of both low-artifact ablation imaging on a standard clinical imaging system and high-frame rate myocardial wall strain rate imaging for detecting changes in cardiac mechanics associated with ablation. CONCLUSIONS: The imaging resolution performance of this very small array device, together with its penetration beyond 2 cm, is excellent considering its very small array aperture. The forward-looking intracardiac catheter has been adapted to work easily on an existing commercial imaging platform with very minor software modifications.
OBJECTIVE: The purpose of this study was to develop a high-resolution, near-field-optimized 14-MHz, 24-element broad-bandwidth forward-looking array for integration on a steerable 9F electrophysiology (EP) catheter. METHODS: Several generations of prototype imaging catheters with bidirectional steering, termed microlinear (ML), were built and tested as integrated catheter designs with EP sensing electrodes near the tip. The wide-bandwidth ultrasound array was mounted on the very tip, equipped with an aperture of only 1.2 by 1.58 mm. The array pulse echo performance was fully simulated, and its construction offered shielding from ablation noise. Both ex vivo and in vivo imaging with a porcine animal model were performed. RESULTS: The array pulse echo performance was concordant with Krimholtz-Leedom-Matthaei model simulation. Three generations of prototype devices were tested in the right atrium and ventricle in 4 acute pig studies for the following characteristics: (1) image quality, (2) anatomic identification, (3) visualization of other catheter devices, and (4) for a mechanism for stabilization when imaging ablation. The ML catheter is capable of both low-artifact ablation imaging on a standard clinical imaging system and high-frame rate myocardial wall strain rate imaging for detecting changes in cardiac mechanics associated with ablation. CONCLUSIONS: The imaging resolution performance of this very small array device, together with its penetration beyond 2 cm, is excellent considering its very small array aperture. The forward-looking intracardiac catheter has been adapted to work easily on an existing commercial imaging platform with very minor software modifications.
Authors: L Gatzoulis; R J Watson; L B Jordan; S D Pye; T Anderson; N Uren; D M Salter; K A Fox; W N McDicken Journal: Ultrasound Med Biol Date: 2001-07 Impact factor: 2.998
Authors: S L Schwartz; N G Pandian; B S Kusay; R Kumar; A Weintraub; S E Katz; M Aronovitz Journal: Echocardiography Date: 1990-07 Impact factor: 1.724
Authors: Douglas N Stephens; Jonathan Cannata; Ruibin Liu; Jian Zhong Zhao; K Kirk Shung; Hien Nguyen; Raymond Chia; Aaron Dentinger; Douglas Wildes; Kai E Thomenius; Aman Mahajan; Kalyanam Shivkumar; Kang Kim; Matthew O'Donnell; David Sahn Journal: IEEE Trans Ultrason Ferroelectr Freq Control Date: 2008-03 Impact factor: 2.725
Authors: Douglas L Packer; Carolyn L Stevens; Michael G Curley; Charles J Bruce; Fletcher A Miller; Bijoy K Khandheria; Jae K Oh; Lawrence J Sinak; James B Seward Journal: J Am Coll Cardiol Date: 2002-02-06 Impact factor: 24.094
Authors: W W Lai; Y al-Khatib; T S Klitzner; J S Child; G T Wetzel; L A Saxon; W G Stevenson; R G Williams Journal: Am J Cardiol Date: 1993-04-01 Impact factor: 2.778
Authors: Ismail T Dairywala; Peng Li; Zheng Liu; Dana Bowie; Scott R Stewart; Abdel-Azim Bayoumy; Thippeswamy H Murthy; Mani A Vannan Journal: J Am Soc Echocardiogr Date: 2002-02 Impact factor: 5.251
Authors: Donald M Lloyd-Jones; Thomas J Wang; Eric P Leip; Martin G Larson; Daniel Levy; Ramachandran S Vasan; Ralph B D'Agostino; Joseph M Massaro; Alexa Beiser; Philip A Wolf; Emelia J Benjamin Journal: Circulation Date: 2004-08-16 Impact factor: 29.690
Authors: Douglas N Stephens; Uyen T Truong; Amin Nikoozadeh; Omer Oralkan; Chi Hyung Seo; Jonathan Cannata; Aaron Dentinger; Kai Thomenius; Alan de la Rama; Tho Nguyen; Feng Lin; Pierre Khuri-Yakub; Aman Mahajan; Kalyanam Shivkumar; Matt O'Donnell; David J Sahn Journal: J Ultrasound Med Date: 2012-02 Impact factor: 2.153
Authors: Chi Hyung Seo; Douglas N Stephens; Jonathan Cannata; Aaron Dentinger; Feng Lin; Suhyun Park; Douglas Wildes; Kai E Thomenius; Peter Chen; Tho Nguyen; Alan de La Rama; Jong Seob Jeong; Aman Mahajan; Kalyanam Shivkumar; Amin Nikoozadeh; Omer Oralkan; Uyen Truong; David J Sahn; Pierre T Khuri-Yakub; Matthew O'Donnell Journal: IEEE Trans Ultrason Ferroelectr Freq Control Date: 2011-07 Impact factor: 2.725
Authors: Chi Tat Chiu; Bong Jin Kang; Payam Eliahoo; Theodore Abraham; K Kirk Shung Journal: IEEE Trans Ultrason Ferroelectr Freq Control Date: 2017-05-29 Impact factor: 2.725