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After graduating from Texas A&M University, where he first discovered his love for construction and real estate, he quickly climbed the ranks and made substantial contributions at leading development groups, including The Hanover Company, Skanska Commercial Development, and Embrey Partners. Demonstrating a keen skill for analyzing markets and overseeing every aspect of the development process, he built relationships, led teams, and became an expert in identifying opportunities and executing highly complex projects start to finish.

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The principal idea of OCT is that depth information is encoded in light that reflects from a sample. The depth information can be extracted via OCT in any of several methods. The methods fall into one of two broad categories to be described below. A Michelson type interferometer is utilized as the basis of any OCT system (Figure 2). The first implementation of OCT was called Time Domain OCT (TD-OCT). The fundamentals of TD-OCT rely on light from a broadband light source being split into two paths by a beamsplitter. After passing through the beamsplitter, one beam is directed to the sample and the other to a mobile reference mirror. The light from the reference arm will travel a specific optical distance as it moves, and because of the low coherence length of the source, will form an interference pattern only with light that travels the same optical distance in the sample arm. The intensity of the interference as the mirror moves provides a map of the depth profile (the “A-scan”). By rastering the location of the A-scan, the interference pattern can produce two-dimensional (2D) and three-dimensional (3D) images of tissues in the body.

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Since 2004, John Kirk has overseen nearly 100 development projects, including over 20,000 multifamily units, over 3 million square feet of class-A commercial office space, totaling $8 billion in project costs.

Fourier domain OCT (FD-OCT) is another method of extracting a depth profile from interference generated in a Michelson interferometer. Like time-domain OCT, it utilizes reflection from a reference mirror and reflection from the sample, but in this case the reference mirror is stationary. The spectrum of the recombined light is acquired by, for example, using a grating to spread the spectrum onto an array detector. The depth information is coded in the spectrum of the interference signal. Once spectral information is collected from the interferometric signal, the A-scan (depth profile) is computed via Fourier transformation to yield high resolution images.

Beyond Lightpath, Roper is incredibly involved in his community. He currently serves as a Co-Chair for the Urban Land Institute’s Local Member Council for Housing where he actively co-leads a group of eighteen housing experts to discuss housing-related successes, issues, and solutions. Roper attends First Presbyterian Church of San Antonio where he serves as the Young Adult Outreach Chair and volunteers with the middle school youth ministry.

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During his time at the University of Texas at Austin, Roper graduated from the Canfield Business Honors and Plan II Honors programs, obtaining a dual degree with a Bachelor of Business Administration and a Bachelor of Arts. After graduation, he was admitted to the Emerging Leader Council at the University of Texas at Austin’s Real Estate Center. In this selective group of only 62 members, Roper is honored to serve on the five-member leadership committee.

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Our name is inspired from scripture, as we are driven by Christ-centered principles, and strive to positively touch the lives of every person with which we interact.

In the years since OCT was first introduced, many enhancements have been developed. The effort to improve the technique continues to this day. One particularly promising enhancement is the use of adaptive optics to improve the clarity of OCT images. Adaptive optics OCT (AO-OCT), as seen in Figure 1, improves system performance by utilizing adaptive technology that corrects the optical wavefront3. For example, a deformable mirror is used in place of a standard optical mirror in an AO-OCT system to reduce present aberrations and yield a higher axial resolution on the order of 2-5µm3.

Chris Roper joins Lightpath from Jones Lang LaSalle (JLL), where he worked as a Multifamily Investment Sales Analyst for the Central Texas region. In this role, Roper valued $5.01 billion of multifamily assets, initiated and executed data-driven marketing campaigns, and established a quarterly multifamily-focused networking group with institutional attendees including developers such as Embrey, Oxbow Development Group, and Karoi Residential.

An OCT system can be constructed from discrete optical components as described below, or from their fiber optic equivalents.

Optical coherence tomography (OCT) is a noninvasive, high-resolution optical imaging technology that creates cross-sectional images from interference signals received from an object under investigation and a local reference. OCT is commonly used in the medical field for disease diagnosis and treatment monitoring to obtain real-time images of specific organs for direct visualization of tissue structures. OCT systems have axial depth resolutions in the range of 5-10µm, providing an in vivo ‘optical biopsy’ of biological tissues (Figure 1).1 Compared to confocal microscopy , OCT can resolve images with 100 times better axial resolution and also provides a label-free method for in vivo diagnosis.2 While a variety of light sources can be used, using a broadband light source for OCT can provide a cost-effective option for system development as well as a safe energy level for use with biological tissues.

Our company aims to create residential projects that transcend mere structures, cultivating a sense of belonging, purpose, and inherent dignity. We find that valuing every person and interaction creates meaningful impact on people’s lives, inspiring excellent outcomes for every person along the path of the investment life cycle.

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The output signal recorded by the detector is a depth scan or commonly referred to as an A-scan or 1D scan (Figure 3). The A-scan describes the axial resolution of the system and it is defined by the bandwidth, or coherence length, of the light source. As the bandwidth of the light source decreases, the axial resolution increases, increasing the system’s resolving power. After an A-scan is collected, the light beam moves laterally across the sample to collect B-scans. The B-scan provides cross-sectional structural information that will produce 2D images based on the magnitude, phase, frequency shift, and polarization of the interference light signal4. 3D or volumetric images are formed by collecting multiple A-scans per B-scan and multiple B-scans per 3D volume4. Intensity information collected in the axial and lateral directions allow for 3D images to be formed in post-processing.

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Another field that OCT has been adapted for is cardiology to diagnose the likelihood of a heart attack. One of the leading causes for heart attacks is atherosclerosis which occurs when ruptured fatty plaques and calcium build-up inside the lining of the artery wall, blocking blood flow.7 Clinicians have turned to utilizing OCT technologies to detect vulnerable plaques prior to rupture. OCT allows physicians to visualize plaque in the arterial wall with an image resolution of 5-7µm to determine the size, shape, and location of the plaque.8 The high sensitivity of OCT allows better axial penetration to view plaques pre-rupture compared to other diagnostic methods such as angiography and intravascular ultrasound, allowing for early diagnosis.

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OCT has allowed clinicians to better diagnose ophthalmic diseases such as age-related macular degeneration (AMD) which causes blurred vision (Figure 5). Two causes of AMD are deterioration of the retina due to tissue thinning (dry AMD) or the formation of leaky blood vessels under the retina (wet AMD).6 OCT technology allows physicians to quantitatively characterize changes in retinal tissue morphology compared to previous procedures that only provide qualitative data.6 For example, OCT can provide images of the retina at a resolution of 5-7µm to track biomarkers like the formation of leaky blood vessels.6 The effectiveness of therapies can also be tracked using OCT by quantifying the retinal thickness and biomarkers to determine if the disease is progressing.

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Chris Roper joins The Lightpath Company as an Investment Associate and brings to the company a successful track record of forming genuine client relationships, financial analysis, and data-driven thought leadership.

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The Lightpath Company is a family of companies that is united in shared values and purpose:building communities where people feel they belong, and leveraging their expertise to deliver value at every level.

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John Kirk, the Founder of The Lightpath Company, has over two decades of expertise and leadership in the real estate development space.

The image produced from an OCT system can be used to visualize the multi-layer structures in a sample such as the layers of the eye (Figure 4). For example, the image below shows an OCT image of the retina on the right compared to a 2D digital retinal image on the left. The OCT image better defines differences in retinal tissue density with changes in color intensity where, for example, scar tissue build-up could be seen. The color scale produced in the image is a result of the difference in reflectivity of the internal structures of the sample.

The Lightpath Company is a fully-integrated multifamily investment firm built on a foundation of Christian values. We seek to foster a sense of belonging, significance, and security in every relationship and project we touch. With verticals in development, construction, investments, and property management, we deliver exceptional communities across the Sun Belt region. Our founder brings over 20 years of expertise in the industry, and a proven track record of delivering extraordinary real estate developments to major markets across the United States.

Edmund Optics® supplies a wide range of optics ideal for OCT systems. As OCT technology advances, Edmund Optics® will continue to expand our product selection and technical support. Noteworthy trends in OCT technology include system portability, accessibility, and miniaturization. Multimodal OCT, which incorporates complementary techniques like microscopy or endoscopy with OCT, AO-OCT, and miniaturized OCT chip-based systems are among the most prevalent future OCT techniques to look out for7. These advanced OCT technologies will continue to drive innovation in the fields of biomedicine, material processing, and other industrial applications where Edmund Optics® will continue to support this application space.

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