1
|
Johansson JD, Hultman M, Saager R. Coagulation depth estimation using a line scanner for depth-resolved laser speckle contrast imaging. BIOMEDICAL OPTICS EXPRESS 2024; 15:4486-4497. [PMID: 39347002 PMCID: PMC11427187 DOI: 10.1364/boe.529043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/01/2024] [Accepted: 06/03/2024] [Indexed: 10/01/2024]
Abstract
Partial-thickness burn wounds extend partially through the dermis, leaving many pain receptors intact and making the injuries very painful. Due to the painfulness, quick assessment of the burn depth is important to not delay surgery of the wound if needed. Laser speckle imaging (LSI) of skin blood flow can be helpful in finding severe coagulation zones with impaired blood flow. However, LSI measurements are typically too superficial to properly reach the full depth of the adult dermis and cannot resolve the flow in depth. Diffuse correlation spectroscopy (DCS) uses varying source-detector separations to allow differentiation of flow depths but requires time-consuming 2D scanning to form an image of the burn area. We here present a prototype for a hybrid DCS and LSI technique called speckle contrast diffuse correlation spectroscopy (scDCS) with the novel approach of using a laser line as a source and using the speckle contrast of averaged images to obtain an estimate of static scattering in the tissue. This will allow for fast non-contact 1D scanning to perform 3D tomographic imaging, making quantitative estimates of the depth and area of the coagulation zone from burn wounds. Simulations and experimental results from a volumetric flow phantom and a gelatin wedge phantom show promise to determine coagulation depth. The aim is to develop a method that, in the future, could provide more quantitative estimates of coagulation depth in partial thickness burn wounds to better estimate when surgery is needed.
Collapse
Affiliation(s)
- Johannes D. Johansson
- Department of Biomedical Engineering, Linköping University, 581 85 Linköping, Sweden
| | - Martin Hultman
- Department of Biomedical Engineering, Linköping University, 581 85 Linköping, Sweden
| | - Rolf Saager
- Department of Biomedical Engineering, Linköping University, 581 85 Linköping, Sweden
| |
Collapse
|
2
|
Ghauri MD, Šušnjar S, Guadagno CN, Bhattacharya S, Thomasson B, Swartling J, Gautam R, Andersson-Engels S, Konugolu Venkata Sekar S. Hybrid heterogeneous phantoms for biomedical applications: a demonstration to dosimetry validation. BIOMEDICAL OPTICS EXPRESS 2024; 15:863-874. [PMID: 38404353 PMCID: PMC10890852 DOI: 10.1364/boe.514994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/12/2024] [Accepted: 01/12/2024] [Indexed: 02/27/2024]
Abstract
Phantoms simultaneously mimicking anatomical and optical properties of real tissues can play a pivotal role for improving dosimetry algorithms. The aim of the paper is to design and develop a hybrid phantom model that builds up on the strengths of solid and liquid phantoms for mimicking various anatomical structures for prostate cancer photodynamic therapy (PDT) dosimetry validation. The model comprises of a photosensitizer-embedded gelatin lesion within a liquid Intralipid prostate shape that is surrounded by a solid silicone outer shell. The hybrid phantom was well characterized for optical properties. The final assembled phantom was also evaluated for fluorescence tomographic reconstruction in conjunction with SpectraCure's IDOSE software. The developed model can lead to advancements in dosimetric evaluations. This would improve PDT outlook as a clinical treatment modality and boost phantom based standardization of biophotonic devices globally.
Collapse
Affiliation(s)
- M. Daniyal Ghauri
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
- Department of Engineering and Food Sciences, University College Cork, College Road, Cork, T12 K8AF, Ireland
| | - Stefan Šušnjar
- SpectraCure AB, Gasverksgatan 1, SE-222 29 Lund, Sweden
- Department of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
| | - Claudia Nunzia Guadagno
- BioPixS Ltd – Biophotonics Standards, IPIC, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
| | - Somdatta Bhattacharya
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
| | | | | | - Rekha Gautam
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
| | - Stefan Andersson-Engels
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
- BioPixS Ltd – Biophotonics Standards, IPIC, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
- Department of Physics, University College Cork, College Road, Cork, T12 K8AF, Ireland
| | - Sanathana Konugolu Venkata Sekar
- Tyndall National Institute, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
- BioPixS Ltd – Biophotonics Standards, IPIC, Lee Maltings Complex, Dyke Parade, T12R5CP, Cork, Ireland
| |
Collapse
|
3
|
Walter AB, Jansen ED. Development of a platform for broadband, spectra-fitted, tissue optical phantoms. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:025001. [PMID: 36814953 PMCID: PMC9940728 DOI: 10.1117/1.jbo.28.2.025001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
SIGNIFICANCE Current methods of producing optical phantoms are incapable of accurately capturing the wavelength-dependent properties of tissue critical for many optical modalities. AIM We aim to introduce a method of producing solid, inorganic phantoms whose wavelength-dependent optical properties can be matched to those of tissue over the wavelength range of 370 to 950 nm. APPROACH The concentration-dependent optical properties of 20 pigments were characterized and used to determine combinations that result in optimal fits compared to the target properties over the full spectrum. Phantoms matching the optical properties of muscle and nerve, the diffuse reflectance of pale and melanistic skin, and the chromophore concentrations of a computational skin model with varying oxygen saturation ( StO 2 ) were made with this method. RESULTS Both optical property phantoms were found to accurately mimic their respective tissues' absorption and scattering properties across the entire spectrum. The diffuse reflectance phantoms were able to closely approximate skin reflectance regardless of skin type. All three computational skin phantoms were found to have emulated chromophore concentrations close to the model, with an average percent error for the StO 2 of 4.31%. CONCLUSIONS This multipigment phantom platform represents a powerful tool for creating spectrally accurate tissue phantoms, which should increase the availability of standards for many optical techniques.
Collapse
Affiliation(s)
- Alec B. Walter
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
- Vanderbilt University, Biophotonics Center, Nashville, Tennessee, United States
| | - E. Duco Jansen
- Vanderbilt University, Department of Biomedical Engineering, Nashville, Tennessee, United States
- Vanderbilt University, Biophotonics Center, Nashville, Tennessee, United States
- Vanderbilt University Medical Center, Department of Neurosurgery, Nashville, Tennessee, United States
| |
Collapse
|