Comparison of nonuniform rotational distortion between mechanical IVUS and OCT using a phantom model

Kawase, Yoshiaki; Suzuki, Yoriyasu; Ikeno, Fumiaki; Yoneyama, Ryuichi; Hoshino, Kozo; Ly, Hung Q.; Lau, George T.; Hayase, Motoya; Yeung, Alan C.; Hajjar, Roger J.; Jang, Ik-Kyung

doi:10.1016/j.ultrasmedbio.2006.07.020

« Previous Next »Ultrasound in Medicine and Biology
Volume 33, Issue 1 , Pages 67-73, January 2007

Comparison of nonuniform rotational distortion between mechanical IVUS and OCT using a phantom model

Yoshiaki Kawase
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
Yoriyasu Suzuki
- Stanford Medical Center, Division of Cardiovascular Medicine, Stanford, CA, USA
Fumiaki Ikeno
- Stanford Medical Center, Division of Cardiovascular Medicine, Stanford, CA, USA
Ryuichi Yoneyama
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
Kozo Hoshino
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
Hung Q. Ly
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
George T. Lau
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
Motoya Hayase
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
Alan C. Yeung
- Stanford Medical Center, Division of Cardiovascular Medicine, Stanford, CA, USA
Roger J. Hajjar
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
Ik-Kyung Jang
- Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Address correspondence to: Ik-Kyung Jang, MD, PhD, Cardiology Laboratory of Integrative Physiology and Imaging, Massachusetts General Hospital, 55 Fruit Street, Bulfinch 161, Boston, MA 02114 USA.

Received 10 January 2006; received in revised form 27 June 2006; accepted 13 July 2006.

Abstract

Optical coherence tomography (OCT) is an optical analog of mechanical intravascular ultrasound (M-IVUS) with much higher spatial resolution. However, no data exist regarding the nonuniform rotational distortion (NURD) with OCT. The aim of the study was to investigate whether OCT generates less NURD relative to M-IVUS. A coronary artery phantom model was constructed with a rubber ring (3.68 mm in diameter), located at the distal end of the phantom. This model was also composed of eight equally spaced steel wires and an additional marker-wire. Two types of vascular phantoms were used, mild curve (90°) and acute curve (near 180°). Subsequent M-IVUS (n = 6) and OCT (n = 6) imaging was performed. Eight angles between eight wires, except the marker-wire, were measured from each image. These angles, measured with M-IVUS and OCT, were compared with those of high-resolution optical photography as a gold standard. The average in angle differences was significantly smaller in OCT compared with M-IVUS in the mild curve model (3.2 ± 1.0° vs, 6.9 ± 2.1°, p < 0.01). Compared with the latter model, the average in angle differences was exaggerated in the acute curve model with M-IVUS (9.1 ± 0.9° vs. 6.9 ± 2.1°, p < 0.05) but not with OCT (3.5 ± 0.8° vs. 3.2 ± 1.0°, p= not significant). OCT generates significantly less NURD compared with M-IVUS, especially in tortuous situation. (E-mail: ijang@partners.org)

Key Words: Optical coherence tomography, Mechanical intravascular ultrasound, Nonuniform rotational distortion