Apparatus and method for rangings and noise reduction of low coherence interferometry (LCI) and optical coherence tomography (OCT) signals

A signal and detector technology, applied in the field of devices and methods for distance measurement and noise reduction of LCI and OCT signals, can solve the problems of sample arm beam auto-correlation noise, interferometer phase instability, and limited charge storage capacity, etc. Achieve improved utilization, high resolution, improved performance

Inactive Publication Date: 2010-08-04
THE GENERAL HOSPITAL CORP
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Problems solved by technology

Because of the limited charge storage capacity, the reference arm power needs to be of the same order as the sample arm power, causing autocorrelation noise on the sample arm beam
Also, since no carrier is generated, the noise in...

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  • Apparatus and method for rangings and noise reduction of low coherence interferometry (LCI) and optical coherence tomography (OCT) signals
  • Apparatus and method for rangings and noise reduction of low coherence interferometry (LCI) and optical coherence tomography (OCT) signals
  • Apparatus and method for rangings and noise reduction of low coherence interferometry (LCI) and optical coherence tomography (OCT) signals

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[0202] The method according to the invention has been verified in the laboratory by the following experiments. In existing OCT systems, the scattered noise power spectrum is determined from the spectral density caused by the measured reference arm optical power. Subsequently, the spectrum of the reference arm 2 / 3 was blocked, and it was experimentally confirmed that the scattering noise power spectrum was reduced by a factor of 3, which in turn shows that if the spectrum is divided into three spectral bands (see Figure 16), then the scattering noise Just reduce it by 3 times. The upper curve (dashed gray line) shows the power spectrum of the OCT signal using one detector. For the lower curve (solid line), the spectrum is limited to 1 / 3 corresponding to a 3-fold improvement in signal-to-noise ratio. This data was generated experimentally, blocking 2 / 3 of the spectrum in a grating that rapidly scans the optical delay line with double-pass pulse shaping.

[0203] An object wit...

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Abstract

Apparatus, method, logic arrangement and storage medium are provided for increasing the sensitivity in the detection of optical coherence tomography and low coherence interferometry (''LCI'') signals by detecting a parallel set of spectral bands, each band being a unique combination of optical frequencies. The LCI broad bandwidth source can be split into N spectral bands. The N spectral bands can be individually detected and processed to provide an increase in the signal-to-noise ratio by a factor of N. Each spectral band may be detected by a separate photo detector and amplified. For each spectral band, the signal can be band pass filtered around the signal band by analog electronics and digitized, or, alternatively, the signal may be digitized and band pass filtered in software. As a consequence, the shot noise contribution to the signal is likely reduced by a factor equal to the number of spectral bands, while the signal amplitude can remain the same. The reduction of the shot noise increases the dynamic range and sensitivity of the system.

Description

[0001] This application is a divisional application of the invention patent application with application number 03802734.8. [0002] The filing date of the original case: January 24, 2003. [0003] Title of original patent invention: Apparatus and method for ranging and noise reduction of low-coherence interferometry (LCI) and optical coherence tomography (OCT) signals using parallel detection of spectral bands. [0004] Original application number: 03802734.8, international application number: PCT / US03 / 02349 [0005] Cross-references to related applications [0006] This application claims Ser. No. 60 / 351,904, filed January 24, 2002, entitled "Ranging and Summarizing of Low Coherence Interferometry (LCI) and Optical Coherence Tomography (OCT) Signals Using Parallel Detection of Spectral Bands." Apparatus and Method for Scattering Noise Reduction," and Pending U.S. Provisional Patent Application No. 10 / 136,813, filed April 30, 2002, entitled "Using Dynamic Feedback to Control...

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Application Information

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IPC IPC(8): G01N21/45A61B5/00A61B3/00G01N21/17A61B1/00A61B10/00G01B9/02G01N21/47
CPCG01B9/02032A61B5/6852G01B9/02044A61B5/7257G01B9/02008G01B9/02091G01B9/02007G01B9/02G01B2290/45G01N21/4795A61B5/0066
Inventor 约翰尼斯·菲茨杰拉德·德博尔吉勒摩·J·蒂尔尼布雷特·尤金·博马
Owner THE GENERAL HOSPITAL CORP
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