1
|
Das D, Sharma A, Rajendran P, Pramanik M. Another decade of photoacoustic imaging. Phys Med Biol 2020; 66. [PMID: 33361580 DOI: 10.1088/1361-6560/abd669] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 12/23/2020] [Indexed: 01/09/2023]
Abstract
Photoacoustic imaging - a hybrid biomedical imaging modality finding its way to clinical practices. Although the photoacoustic phenomenon was known more than a century back, only in the last two decades it has been widely researched and used for biomedical imaging applications. In this review we focus on the development and progress of the technology in the last decade (2010-2020). From becoming more and more user friendly, cheaper in cost, portable in size, photoacoustic imaging promises a wide range of applications, if translated to clinic. The growth of photoacoustic community is steady, and with several new directions researchers are exploring, it is inevitable that photoacoustic imaging will one day establish itself as a regular imaging system in the clinical practices.
Collapse
Affiliation(s)
- Dhiman Das
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, SINGAPORE
| | - Arunima Sharma
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, SINGAPORE
| | - Praveenbalaji Rajendran
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, SINGAPORE
| | - Manojit Pramanik
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, N1.3-B2-11, Singapore, 637457, SINGAPORE
| |
Collapse
|
2
|
Tamimi EA, Xin H, Witte RS. Real-time 3D thermoacoustic imaging and thermometry using a self-calibration technique. APPLIED OPTICS 2020; 59:G255-G261. [PMID: 32749380 DOI: 10.1364/ao.393083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
Thermoacoustic (TA) imaging is a modality where pulsed microwaves are used to generate ultrasound waves in tissue, which are highly correlated with temperature. This study uses a self-calibration approach to improve the estimation of temperature using 3D real-time TA thermometry in porcine tissue during localized heating. The self-calibration method estimated temperatures at eight embedded thermocouple locations with a normalized root-mean-square error of 3.25±2.08%. The results demonstrate that the method has the suitable accuracy and resolution to provide feedback control for breast cancer ablation therapy.
Collapse
|
3
|
Nan H, Fitzpatrick A, Wang K, Arbabian A. Non-Invasive Remote Temperature Monitoring Using Microwave-Induced Thermoacoustic Imaging. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2019; 2019:6375-6378. [PMID: 31947301 DOI: 10.1109/embc.2019.8857309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Non-invasive temperature monitoring of tissue at depth in real-time is critical to hyperthermia therapies such as high-intensity focused ultrasound. Knowledge of temperature allows for monitoring treatment as well as providing real-time feedback to adjust deposited power in order to maintain safe and effective temperatures. Microwave-induced thermoacoustic (TA) imaging, which combines the conductivity/dielectric contrast of microwave imaging with the resolution of ultrasound, shows potential for estimating temperature non-invasively in real-time by indirectly measuring the temperature dependent parameters from reconstructed images. In this work, we study the temperature dependent behavior of the generated pressure in the TA effect and experimentally demonstrate simultaneous imaging and temperature monitoring using TA imaging. The proof-of-concept experiments demonstrate millimeter spatial resolution while achieving degree-level accuracy.
Collapse
|
4
|
Meng L, Deschaume O, Larbanoix L, Fron E, Bartic C, Laurent S, Van der Auweraer M, Glorieux C. Photoacoustic temperature imaging based on multi-wavelength excitation. PHOTOACOUSTICS 2019; 13:33-45. [PMID: 30555785 PMCID: PMC6277227 DOI: 10.1016/j.pacs.2018.11.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 10/29/2018] [Accepted: 11/15/2018] [Indexed: 05/04/2023]
Abstract
Building further upon the high spatial resolution offered by ultrasonic imaging and the high optical contrast yielded by laser excitation of photoacoustic imaging, and exploiting the temperature dependence of photoacoustic signal amplitudes, this paper addresses the question whether the rich information given by multispectral optoacoustic tomography (MSOT) allows to obtain 3D temperature images. Numerical simulations and experimental results are reported on agarose phantoms containing gold nanoparticles and the effects of shadowing, reconstruction flaws, etc. on the accuracy are determined.
Collapse
Affiliation(s)
- Lei Meng
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
| | - Olivier Deschaume
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
| | - Lionel Larbanoix
- Center for Microscopy and Molecular Imaging, Rue Adrienne Bolland 8, B-6041, Gosselies, Belgium
| | - Eduard Fron
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F - box 2404, 3001 Leuven, Belgium
| | - Carmen Bartic
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
| | - Sophie Laurent
- Center for Microscopy and Molecular Imaging, Rue Adrienne Bolland 8, B-6041, Gosselies, Belgium
| | - Mark Van der Auweraer
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F - box 2404, 3001 Leuven, Belgium
| | - Christ Glorieux
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
- Corresponding author.
| |
Collapse
|
5
|
Yang X, Sun A, Ju BF, Xu S. A rotary scanning method to evaluate grooves and porosity for nerve guide conduits based on ultrasound microscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:073705. [PMID: 30068110 DOI: 10.1063/1.5004783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 06/21/2018] [Indexed: 06/08/2023]
Abstract
Grooved nerve guide conduits (NGCs) have been effective in the clinical treatment of peripheral nerve injury. They are generally fabricated from a micro-structured spinneret using a spinning process, which easily can cause a variety of pores and morphological deviation. The topography of internal grooves as well as the porosity can greatly influence the therapeutic effect. Traditional optical or scanning electron microscopy (SEM) methods can be used to image the grooves; however, these methods are destructive and require slicing NGCs to prepare specimens suitable for imaging. Moreover, lengthy experiments and large batches of NGCs are required to ensure reliable results from both in vitro experiments and clinical studies. In this paper, a non-destructive method for evaluating the grooves and porosity of NGCs is proposed using ultrasonic imaging combined with rotary scanning and an image analysis algorithm. Two ultrasonic methods were used: a 25-MHz point-focus ultrasonic transducer applied to observe axial cross sections of the conduits and a 100-MHz point-focus ultrasonic transducer to detect large pores caused by defects. Furthermore, a theoretical algorithm for detecting the local porosity of a conduit based on density is proposed. Herein, the proposed acoustic method and traditional optical methods are evaluated and compared. A parameter representing the specific surface area of the internal grooves is introduced and computed for both the optical and acoustic methods, and the relative errors of the computed parameter values for three different NGCs were 7.0%, 7.9%, and 15.3%. The detected location and shape of pores were consistent between the acoustic and optical methods, and greater porosity was observed in the middle of the conduit wall. In this paper, the results of the acoustic and optical methods are presented and the errors relating to the acoustic factors, device characteristics, and image processing method are further analyzed.
Collapse
Affiliation(s)
- Xiaoyu Yang
- State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Anyu Sun
- State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Bing-Feng Ju
- State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Shaoning Xu
- Zhejiang Information Institute of Machinery Industry, Hangzhou 310027, People's Republic of China
| |
Collapse
|
6
|
Zhang X, Qian X, Tao C, Liu X. In Vivo Imaging of Microvasculature during Anesthesia with High-Resolution Photoacoustic Microscopy. ULTRASOUND IN MEDICINE & BIOLOGY 2018; 44:1110-1118. [PMID: 29499917 DOI: 10.1016/j.ultrasmedbio.2018.01.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 01/18/2018] [Accepted: 01/23/2018] [Indexed: 05/22/2023]
Abstract
Anesthesia monitoring is extremely important in improving the quality of anesthesia and ensuring the safety of patients in operation. Photoacoustic microscopy (PAM) is proposed to in vivo image the skin microvasculature of 10 nude mice undergoing general anesthesia by using the isoflurane gas with a concentration of 3%. Benefiting from strong optical absorption of hemoglobin, PAM has good contrast and high resolution in mapping of microvasculature. A series of high quality images can clearly reveal the subtle changes of capillaries in morphology over time. Two indices, vessel intensity and vessel density, are extracted from these images to measure the microvasculature quantitatively. The imaging results show that the vessel intensity and density are increased over time. After 65 min, the vessel intensity increased 42.7 ± 8.6% and the density increased 28.6 ± 12.2%. These indices extracted from photoacoustic images accurately reflect the greater blood perfusion undergoing general anesthesia. Additionally, abnormal reductions of vessel intensity and density are also observed as overtime anesthesia. This preclinical study suggests that PAM holds potential to monitor anesthesia by imaging the skin microvasculature.
Collapse
Affiliation(s)
- Xiang Zhang
- MOE Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China
| | - Xiaoqin Qian
- Department of Ultrasound, Affiliated People's Hospital of Jiangsu University, Zhenjiang, Jiangsu, China
| | - Chao Tao
- MOE Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.
| | - Xiaojun Liu
- MOE Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China
| |
Collapse
|
7
|
Hajireza P, Shi W, Bell K, Paproski RJ, Zemp RJ. Non-interferometric photoacoustic remote sensing microscopy. LIGHT, SCIENCE & APPLICATIONS 2017; 6:e16278. [PMID: 30167263 PMCID: PMC6062239 DOI: 10.1038/lsa.2016.278] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 12/21/2016] [Accepted: 01/04/2017] [Indexed: 05/05/2023]
Abstract
Elasto-optical refractive index modulation due to photoacoustic initial pressure transients produced significant reflection of a probe beam when the absorbing interface had an appreciable refractive index difference. This effect was harnessed in a new form of non-contact optical resolution photoacoustic microscopy called photoacoustic remote sensing microscopy. A non-interferometric system architecture with a low-coherence probe beam precludes detection of surface oscillations and other phase-modulation phenomenon. The probe beam was confocal with a scanned excitation beam to ensure detection of initial pressure-induced intensity reflections at the subsurface origin where pressures are largest. Phantom studies confirmed signal dependence on optical absorption, index contrast and excitation fluence. In vivo imaging of superficial microvasculature and melanoma tumors was demonstrated with ~2.7±0.5 μm lateral resolution.
Collapse
Affiliation(s)
- Parsin Hajireza
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4 Canada
- IllumiSonics, Inc., 5205-38A Ave. N.W., Edmonton, Alberta, T6L 2J4, Canada
| | - Wei Shi
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4 Canada
| | - Kevan Bell
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4 Canada
| | - Robert J Paproski
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4 Canada
| | - Roger J Zemp
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4 Canada
- IllumiSonics, Inc., 5205-38A Ave. N.W., Edmonton, Alberta, T6L 2J4, Canada
| |
Collapse
|
8
|
|
9
|
Cheng R, Shao J, Gao X, Tao C, Ge J, Liu X. Noninvasive Assessment of Early Dental Lesion Using a Dual-Contrast Photoacoustic Tomography. Sci Rep 2016; 6:21798. [PMID: 26902394 PMCID: PMC4763185 DOI: 10.1038/srep21798] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 02/01/2016] [Indexed: 11/09/2022] Open
Abstract
Dental hard tissue lesions, including caries, cracked-tooth, etc., are the most prevalent diseases of people worldwide. Dental lesions and correlative diseases greatly decrease the life quality of patients throughout their lifetime. It is still hard to noninvasively detect these dental lesions in their early stages. Photoacoustic imaging is an emerging hybrid technology combining the high spatial resolution of ultrasound in deep tissue with the rich optical contrasts. In this study, a dual-contrast photoacoustic tomography is applied to detect the early dental lesions. One contrast, named B-mode, is related to the optical absorption. It is good at providing the sharp image about the morphological and macro-structural features of the teeth. Another contrast, named S-mode, is associated with the micro-structural and mechanical properties of the hard tissue. It is sensitive to the change of tissue properties induced by the early dental lesions. Experiments show that the comprehensive analysis of dual-contrast information can provide reliable information of the early dental lesions. Moreover, the imaging parameter of S-mode is device-independent and it could measure tissue properties quantitatively. We expect that the proposed scheme could be beneficial for improving safety, accuracy and sensitivity of the clinical diagnosis of the dental lesion.
Collapse
Affiliation(s)
- Renxiang Cheng
- Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Jiaojiao Shao
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, China
| | - Xiaoxiang Gao
- Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Chao Tao
- Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Jiuyu Ge
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, China
| | - Xiaojun Liu
- Key Laboratory of Modern Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| |
Collapse
|
10
|
Noninvasive Assessment of Early Dental Lesion Using a Dual-Contrast Photoacoustic Tomography. Sci Rep 2016. [DOI: 10.1038/srep21798%20https:/www.ncbi.nlm.nih.gov/pmc/articles/pmc4763185/pdf/srep21798.pdf] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
AbstractDental hard tissue lesions, including caries, cracked-tooth, etc., are the most prevalent diseases of people worldwide. Dental lesions and correlative diseases greatly decrease the life quality of patients throughout their lifetime. It is still hard to noninvasively detect these dental lesions in their early stages. Photoacoustic imaging is an emerging hybrid technology combining the high spatial resolution of ultrasound in deep tissue with the rich optical contrasts. In this study, a dual-contrast photoacoustic tomography is applied to detect the early dental lesions. One contrast, named B-mode, is related to the optical absorption. It is good at providing the sharp image about the morphological and macro-structural features of the teeth. Another contrast, named S-mode, is associated with the micro-structural and mechanical properties of the hard tissue. It is sensitive to the change of tissue properties induced by the early dental lesions. Experiments show that the comprehensive analysis of dual-contrast information can provide reliable information of the early dental lesions. Moreover, the imaging parameter of S-mode is device-independent and it could measure tissue properties quantitatively. We expect that the proposed scheme could be beneficial for improving safety, accuracy and sensitivity of the clinical diagnosis of the dental lesion.
Collapse
|
11
|
Tian C, Xie Z, Fabiilli ML, Wang X. Imaging and sensing based on dual-pulse nonlinear photoacoustic contrast: a preliminary study on fatty liver. OPTICS LETTERS 2015; 40:2253-6. [PMID: 26393712 PMCID: PMC4581454 DOI: 10.1364/ol.40.002253] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The feasibility of diagnostic imaging and tissue characterization based on a new contrast realized by dual-pulse photoacoustic measurement was studied. Unlike current photoacoustic methods which are mostly focused on the measurement of tissue optical absorption, this contrast revealed by a dual-pulse laser excitation process takes advantage of the temperature dependence of the Grüneisen parameter of tissue. The first laser pulse heats the sample and causes a temperature rise in the target tissue, which leads to a change of the Grüneisen parameter and the amplitude of the photoacoustic signal from the second laser pulse. This new contrast is then quantified by percentile change in the second pulse signal as a result of the first laser pulse. Since the temperature-dependent Grüneisen parameter is tissue specific and closely relevant to chemical and molecular properties of the sample, the dual-pulse photoacoustic measurement can differentiate various tissue types and conditions. The preliminary study on phantoms and a mouse model has suggested the capability of the proposed contrast in the characterization of fatty livers and the potential for future clinical diagnosis of liver conditions.
Collapse
Affiliation(s)
- Chao Tian
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Zhixing Xie
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Mario L. Fabiilli
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Xueding Wang
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, USA
| |
Collapse
|
12
|
Gould T, Wang Q, Pfefer TJ. Optical-thermal light-tissue interactions during photoacoustic breast imaging. BIOMEDICAL OPTICS EXPRESS 2014; 5:832-47. [PMID: 24688817 PMCID: PMC3959836 DOI: 10.1364/boe.5.000832] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/26/2014] [Accepted: 01/29/2014] [Indexed: 05/04/2023]
Abstract
Light-tissue interactions during photoacoustic imaging, including dynamic heat transfer processes in and around vascular structures, are not well established. A three-dimensional, transient, optical-thermal computational model was used to simulate energy deposition, temperature distributions and thermal damage in breast tissue during exposure to pulsed laser trains at 800 and 1064 nm. Rapid and repetitive temperature increases and thermal relaxation led to superpositioning effects that were highly dependent on vessel diameter and depth. For a ten second exposure at established safety limits, the maximum single-pulse and total temperature rise levels were 0.2°C and 5.8°C, respectively. No significant thermal damage was predicted. The impact of tissue optical properties, surface boundary condition and irradiation wavelength on peak temperature location and temperature evolution with time are discussed.
Collapse
|
13
|
Chen YS, Frey W, Walker C, Aglyamov S, Emelianov S. Sensitivity enhanced nanothermal sensors for photoacoustic temperature mapping. JOURNAL OF BIOPHOTONICS 2013; 6:534-42. [PMID: 23450812 DOI: 10.1002/jbio.201200219] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2012] [Revised: 01/24/2013] [Accepted: 02/11/2013] [Indexed: 05/07/2023]
Abstract
Photoacoustic imaging can be used to guide and validate the therapeutic outcome of nanoparticle-mediated photothermal therapy through its ability to visualize the delivery of nanoparticle contrast agents, image the temperature distribution inside living tissue, and confirm tissue coagulation. In this image-guided process, temperature mapping plays a critical role for thermal dosage control. Therefore, developing a sensitive and accurate photoacoustic technique to quantitatively measure the temperature distribution during thermal therapy is essential. In this study, we investigated and demonstrated that silica-coated gold nanorods, can provide a multi-fold improvement in sensitivity of the photoacoustic temperature mapping compared to gold nanorods without silica coating, and serve as a nanothermal sensor to accurately and quantitatively visualize temperature distributions during photothermal therapy.
Collapse
Affiliation(s)
- Yun-Sheng Chen
- Department of Biomedical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | | | | | | | | |
Collapse
|
14
|
Shao P, Cox B, Zemp RJ. Estimating optical absorption, scattering, and Grueneisen distributions with multiple-illumination photoacoustic tomography. APPLIED OPTICS 2011; 50:3145-54. [PMID: 21743514 DOI: 10.1364/ao.50.003145] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
While photoacoustic methods offer significant promise for high-resolution optical contrast imaging, quantification has thus far proved challenging. In this paper, a noniterative reconstruction technique for producing quantitative photoacoustic images of both absorption and scattering perturbations is introduced for the case when the optical properties of the turbid background are known and multiple optical illumination locations are used. Through theoretical developments and computational examples, it is demonstrated that multiple-illumination photoacoustic tomography (MI-PAT) can alleviate ill-posedness due to absorption-scattering nonuniqueness and produce quantitative high-resolution reconstructions of optical absorption, scattering, and Gruneisen parameter distributions. While numerical challenges still exist, we show that the linearized MI-PAT framework that we propose has orders of magnitude improved condition number compared with CW diffuse optical tomography.
Collapse
Affiliation(s)
- Peng Shao
- Department of Electrical and Computer Engineering, University of Alberta, 9107-116 Street, Edmonton, Alberta, Canada, T6G 2V4
| | | | | |
Collapse
|
15
|
Wang B, Su JL, Karpiouk AB, Sokolov KV, Smalling RW, Emelianov SY. Intravascular Photoacoustic Imaging. IEEE JOURNAL OF QUANTUM ELECTRONICS 2010; 16:588-599. [PMID: 21359138 PMCID: PMC3045110 DOI: 10.1109/jstqe.2009.2037023] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Intravascular photoacoustic (IVPA) imaging is a catheter-based, minimally invasive, imaging modality capable of providing high-resolution optical absorption map of the arterial wall. Integrated with intravascular ultrasound (IVUS) imaging, combined IVPA and IVUS imaging can be used to detect and characterize atherosclerotic plaques building up in the inner lining of an artery. In this paper, we present and discuss various representative applications of combined IVPA/IVUS imaging of atherosclerosis, including assessment of the composition of atherosclerotic plaques, imaging of macrophages within the plaques, and molecular imaging of biomarkers associated with formation and development of plaques. In addition, imaging of coronary artery stents using IVPA and IVUS imaging is demonstrated. Furthermore, the design of an integrated IVUS/IVPA imaging catheter needed for in vivo clinical applications is discussed.
Collapse
Affiliation(s)
- Bo Wang
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712 USA
| | - Jimmy L. Su
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712 USA
| | - Andrei B. Karpiouk
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712 USA
| | - Konstantin V. Sokolov
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712 USA, and also with the Department of Imaging Physics, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030 USA
| | - Richard W. Smalling
- Division of Cardiology, University of Texas Health Science Center, Houston, TX 77030 USA, and also with the Memorial Hermann Heart and Vascular Institute, Houston, TX 77024 USA
| | - Stanislav Y. Emelianov
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712 USA
| |
Collapse
|
16
|
Chen YS, Frey W, Kim S, Homan K, Kruizinga P, Sokolov K, Emelianov S. Enhanced thermal stability of silica-coated gold nanorods for photoacoustic imaging and image-guided therapy. OPTICS EXPRESS 2010; 18:8867-78. [PMID: 20588732 PMCID: PMC3404861 DOI: 10.1364/oe.18.008867] [Citation(s) in RCA: 169] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 03/29/2010] [Accepted: 03/30/2010] [Indexed: 05/19/2023]
Abstract
Photothermal stability and, therefore, consistency of both optical absorption and photoacoustic response of the plasmonic nanoabsorbers is critical for successful photoacoustic image-guided photothermal therapy. In this study, silica-coated gold nanorods were developed as a multifunctional molecular imaging and therapeutic agent suitable for image-guided photothermal therapy. The optical properties and photothermal stability of silica-coated gold nanorods under intense irradiation with nanosecond laser pulses were investigated by UV-Vis spectroscopy and transmission electron microscopy. Silica-coated gold nanorods showed increased photothermal stability and retained their superior optical properties under much higher fluences. The changes in photoacoustic response of PEGylated and silica-coated nanorods under laser pulses of various fluences were compared. The silica-coated gold nanorods provide a stable photoacoustic signal, which implies better imaging capabilities and make silica-coated gold nanorods a promising imaging and therapeutic nano-agent for photoacoustic imaging and image-guided photothermal therapy.
Collapse
Affiliation(s)
- Yun-Sheng Chen
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
- Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
| | - Wolfgang Frey
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
| | - Seungsoo Kim
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
| | - Kimberly Homan
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
| | - Pieter Kruizinga
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
| | - Konstantin Sokolov
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
- Department of Imaging Physics, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030,
USA
| | - Stanislav Emelianov
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
- Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX, 78712,
USA
- Department of Imaging Physics, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030,
USA
| |
Collapse
|
17
|
Homan K, Shah J, Gomez S, Gensler H, Karpiouk A, Brannon-Peppas L, Emelianov S. Silver nanosystems for photoacoustic imaging and image-guided therapy. JOURNAL OF BIOMEDICAL OPTICS 2010; 15:021316. [PMID: 20459238 PMCID: PMC2859084 DOI: 10.1117/1.3365937] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Revised: 01/05/2010] [Accepted: 01/06/2010] [Indexed: 05/23/2023]
Abstract
Due to their optical absorption properties, metallic nanoparticles are excellent photoacoustic imaging contrast agents. A silver nanosystem is presented here as a potential contrast agent for photoacoustic imaging and image-guided therapy. Currently, the nanosystem consists of a porous silver layer deposited on the surface of spherical silica cores ranging in diameter from 180 to 520 nm. The porous nature of the silver layer will allow for release of drugs or other therapeutic agents encapsulated in the core in future applications. In their current PEGylated form, the silver nanosystem is shown to be nontoxic in vitro at concentrations of silver up to 2 mgml. Furthermore, the near-infrared absorbance properties of the nanosystem are demonstrated by measuring strong, concentration-dependent photoacoustic signal from the silver nanosystem embedded in an ex vivo tissue sample. Our study suggests that silver nanosystems can be used as multifunctional agents capable of augmenting image-guided therapy techniques.
Collapse
Affiliation(s)
- Kimberly Homan
- The University of Texas at Austin, Biomedical Engineering Department, 1 University Station C0800, Austin, Texas 78712, USA
| | | | | | | | | | | | | |
Collapse
|
18
|
Karpiouk AB, Wang B, Emelianov SY. Development of a catheter for combined intravascular ultrasound and photoacoustic imaging. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:014901. [PMID: 20113121 PMCID: PMC2814830 DOI: 10.1063/1.3274197] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Accepted: 11/23/2009] [Indexed: 05/18/2023]
Abstract
Atherosclerosis is characterized by formation and development of the plaques in the inner layer of the vessel wall. To detect and characterize atherosclerotic plaques, we previously introduced the combined intravascular ultrasound (IVUS) and intravascular photoacoustic (IVPA) imaging capable of assessing plaque morphology and composition. The utility of IVUS/IVPA imaging has been demonstrated by imaging tissue-mimicking phantoms and ex vivo arterial samples using laboratory prototype of the imaging system. However, the clinical realization of a IVUS/IVPA imaging requires an integrated intravascular imaging catheter. In this paper, two designs of IVUS/IVPA imaging catheters--side fire fiber-based and mirror-based catheters--are reported. A commercially available IVUS imaging catheter was utilized for both pulse-echo ultrasound imaging and detection of photoacoustic transients. Laser pulses were delivered by custom-designed fiber-based optical systems. The optical fiber and IVUS imaging catheter were combined into a single device. Both designs were tested and compared using point targets and tissue-mimicking phantoms. The results indicate applicability of the proposed catheters for clinical use.
Collapse
Affiliation(s)
- Andrei B Karpiouk
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | | | | |
Collapse
|
19
|
Pramanik M, Wang LV. Thermoacoustic and photoacoustic sensing of temperature. JOURNAL OF BIOMEDICAL OPTICS 2009; 14:054024. [PMID: 19895126 PMCID: PMC2774978 DOI: 10.1117/1.3247155] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2009] [Revised: 07/07/2009] [Accepted: 08/06/2009] [Indexed: 05/18/2023]
Abstract
We present a novel temperature-sensing technique using thermoacoustic and photoacoustic measurements. This noninvasive method has been demonstrated using a tissue phantom to have high temporal resolution and temperature sensitivity. Because both photoacoustic and thermoacoustic signal amplitudes depend on the temperature of the source object, the signal amplitudes can be used to monitor the temperature. A temperature sensitivity of 0.15 degrees C was obtained at a temporal resolution as short as 2 s, taking the average of 20 signals. The deep-tissue imaging capability of this technique can potentially lead us to in vivo temperature monitoring in thermal or cryogenic applications.
Collapse
Affiliation(s)
- Manojit Pramanik
- Washington University in St. Louis, Department of Biomedical Engineering, Optical Imaging Laboratory, Campus Box 1097, One Brookings Drive, St. Louis, Missouri 63130, USA
| | | |
Collapse
|
20
|
Abstract
Photoacoustic tomography (PAT) is probably the fastest growing biomedical imaging technology owing to its capability of high-resolution sensing of rich optical contrast in vivo at depths beyond the optical transport mean free path (~1 mm in the skin). Existing high-resolution optical imaging technologies, such as confocal microscopy and two-photon microscopy, have fundamentally impacted biomedicine but cannot reach such depths. Taking advantage of low ultrasonic scattering, PAT indirectly improves tissue transparency by 100 to 1000 fold and consequently enables deeply penetrating functional and molecular imaging at high spatial resolution. Further, PAT holds the promise of in vivo imaging at multiple length scales ranging from subcellular organelles to organs with the same contrast origin, an important application in multiscale systems biology research.
Collapse
Affiliation(s)
- Lihong V Wang
- Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, Campus Box 1097, One Brookings Drive, St. Louis, MO 63130-4899
| |
Collapse
|
21
|
Tang MX, Elson DS, Li R, Dunsby C, Eckersley RJ. Photoacoustics, thermoacoustics, and acousto-optics for biomedical imaging. Proc Inst Mech Eng H 2009; 224:291-306. [DOI: 10.1243/09544119jeim598] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Recently there have been significant advances in developing hybrid techniques combining electromagnetic waves with ultrasound for biomedical imaging, namely photoacoustic, thermoacoustic, and acousto-optic (or ultrasound modulated optical) tomography. All three techniques take advantage of tissue contrast offered by electromagnetic (EM) waves, while achieving good spatial resolution in deeper tissue facilitated by ultrasound. In this review the principles of the three techniques are introduced. A description of existing experimental and image reconstruction techniques is provided. Some recent key developments are highlighted and current issues in each of the areas are discussed.
Collapse
Affiliation(s)
- M-X Tang
- Department of Bioengineering, Imperial College London, London, UK
| | - D S Elson
- Institute of Biomedical Engineering, Imperial College London, London, UK
| | - R Li
- Department of Bioengineering, Imperial College London, London, UK
| | - C Dunsby
- Department of Physics, Imperial College London, London, UK
| | - R J Eckersley
- Imaging Sciences Department, Imperial College London, London, UK
| |
Collapse
|
22
|
Fallon D, Yan L, Hanson GW, Patch SK. RF testbed for thermoacoustic tomography. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:064301. [PMID: 19566215 DOI: 10.1063/1.3133802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Thermoacoustic signal excitation is a function of intrinsic tissue properties and illuminating electric field. De-ionized (DI) water is a preferred acoustic coupling medium for thermoacoustics because acoustic and electromagnetic waves propagate in DI water with very little loss. We have designed a water-filled testbed propagating a controlled electric field with respect to pulse shape, power, and polarization. Directional coupler line sections permit measurement of incident, reflected, and transmitted powers. Both S-parameters and E(y) measurement show that the electric-field distribution is relatively uniform in testbed. Comparing baseline power measurements to those taken with a test object in place yields power loss in the object, which should correlate to thermoacoustic signal strength. Moreover, power loss--and therefore thermoacoustic computerized tomography signal strength--is sensitive to the orientation of the object to the polarization of the electric field. This testbed will enable quantitative characterization of the thermoacoustic contrast mechanism in ex vivo tissue specimens.
Collapse
Affiliation(s)
- D Fallon
- Electronics Research Inc., P.O. Box 1176, Gray, Maine 04039, USA
| | | | | | | |
Collapse
|