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Kilian HI, Ma C, Zhang H, Chen M, Nilam A, Quinn B, Tang Y, Xia J, Yao J, Lovell JF. Intraperitoneal administration for sustained photoacoustic contrast agent imaging. Photoacoustics 2022; 28:100406. [PMID: 36213764 PMCID: PMC9535324 DOI: 10.1016/j.pacs.2022.100406] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 09/13/2022] [Accepted: 09/25/2022] [Indexed: 06/16/2023]
Abstract
Photoacoustic (PA) imaging at 1064 nm in the second near-infrared (NIR-II) has attracted recent attention. We recently reported a surfactant-based formulation of a NIR-II dye (BIBDAH) for NIR-II PA contrast. Here, we investigated BIBDAH as a NIR-II PA contrast agent for longitudinal preclinical PA imaging. When administered to mice by the conventional intravenous (I.V.) route, BIBDAH was rapidly cleared from circulation, as indicated by a decrease in NIR-II absorption in sampled plasma. Conversely, when mice were injected with BIBDAH by the intraperitoneal (I.P.) route, peak NIR-II absorption levels in plasma were lower initially, but there was a sustained dye presence that resulted in a more consistent concentration of dye in plasma over 2 days. Increasing the I.P. injection dose and volume resulted in increased NIR-II area under the curve (AUC) in serum. Bimodal PA and ultrasound imaging reflected these results, showing a rapid decrease in PA signal in blood with I.V. administration, but permitting sustained imaging with I.P. administration. These results show that I.P. administration can be considered as an administration route in preclinical animal studies for improved longitudinal observation with more consistent contrast signal intensity.
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Affiliation(s)
- Hailey I. Kilian
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Chenshuo Ma
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Huijuan Zhang
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Maomao Chen
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Anoop Nilam
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Breandan Quinn
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Yuqi Tang
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Jun Xia
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Junjie Yao
- Department of Biomedical Engineering, Duke University, Durham, NC, USA
| | - Jonathan F. Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
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Peng D, He J, Liu H, Cao J, Wang Y, Chen Y. FAPI PET/CT research progress in digestive system tumours. Dig Liver Dis 2022; 54:164-169. [PMID: 34364808 DOI: 10.1016/j.dld.2021.07.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 07/12/2021] [Accepted: 07/14/2021] [Indexed: 12/24/2022]
Abstract
18F-fluorodeoxyglucose positron emission tomography/computed tomography has been used in clinical practice for many years. This modality is of great value for tumour diagnosis, staging, and efficacy evaluations, but it has many limitations in the diagnosis and treatment of digestive system tumours. Fibroblast activation protein is highly expressed in gastrointestinal tumours. Various isotope-labelled fibroblast activation protein inhibitors are widely used in clinical research. These inhibitors have low background uptake in the brain, liver and oral/pharyngeal mucosa and show good contrast between the tumour and background, which makes up for the lack of fluorodeoxyglucose in the diagnosis of digestive system tumours. It better displays the primary tumours, metastases and regional lymph nodes of digestive system tumours, such as oesophageal cancer, gastric cancer and liver cancer, and also provides a new method for treating these tumours. Based on this background, this article introduces the current research status of fibroblast activation protein inhibitor positron emission tomography/computed tomography in various types of digestive system malignant tumours to provide more valuable information for diagnosing and treating digestive system tumours.
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Affiliation(s)
- Dengsai Peng
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No 25 TaiPing St, Jiangyang District, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China; Academician (Expert) Workstation of Sichuan Province, 646000, PR China
| | - Jing He
- Department of Ultrasonography, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China
| | - Hanxiang Liu
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No 25 TaiPing St, Jiangyang District, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China; Academician (Expert) Workstation of Sichuan Province, 646000, PR China
| | - Jianpeng Cao
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No 25 TaiPing St, Jiangyang District, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China; Academician (Expert) Workstation of Sichuan Province, 646000, PR China
| | - Yingwei Wang
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No 25 TaiPing St, Jiangyang District, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China; Academician (Expert) Workstation of Sichuan Province, 646000, PR China
| | - Yue Chen
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, No 25 TaiPing St, Jiangyang District, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China; Academician (Expert) Workstation of Sichuan Province, 646000, PR China.
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Helfield BL, Yoo K, Liu J, Williams R, Sheeran PS, Goertz DE, Burns PN. Investigating the Accumulation of Submicron Phase-Change Droplets in Tumors. Ultrasound Med Biol 2020; 46:2861-2870. [PMID: 32732167 DOI: 10.1016/j.ultrasmedbio.2020.06.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 06/24/2020] [Accepted: 06/27/2020] [Indexed: 06/11/2023]
Abstract
Submicron phase-change droplets are an emerging class of ultrasound contrast agent. Compared with microbubbles, their relatively small size and increased stability offer the potential to passively extravasate and accumulate in solid tumors through the enhanced permeability and retention effect. Under exposure to sufficiently powerful ultrasound, these droplets can convert into in situ gas microbubbles and thus be used as an extravascular-specific contrast agent. However, in vivo imaging methods to detect extravasated droplets have yet to be established. Here, we develop an ultrasound imaging pulse sequence within diagnostic safety limits to selectively detect droplet extravasation in tumors. Tumor-bearing mice were injected with submicron perfluorobutane droplets and interrogated with our imaging-vaporization-imaging sequence. By use of a pulse subtraction method, median droplet extravasation signal relative to the total signal within the tumor was estimated to be Etumor=37±5% compared with the kidney Ekidney=-2±8% (p < 0.001). This work contributes toward the advancement of volatile phase-shift droplets as a next-generation ultrasound agent for imaging and therapy.
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Affiliation(s)
- Brandon L Helfield
- Department of Physics, Concordia University, Montreal, Canada; Department of Biology, Concordia University, Montreal, Canada.
| | - Kimoon Yoo
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada
| | - Jingjing Liu
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada
| | - Ross Williams
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada
| | - Paul S Sheeran
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - David E Goertz
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - Peter N Burns
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Canada
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Nam K, Stanczak M, Forsberg F, Liu JB, Eisenbrey JR, Solomides CC, Lyshchik A. Sentinel Lymph Node Characterization with a Dual-Targeted Molecular Ultrasound Contrast Agent. Mol Imaging Biol 2019; 20:221-229. [PMID: 28762204 DOI: 10.1007/s11307-017-1109-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE The purpose of this study was to assess the performance of molecular ultrasound with dual-targeted microbubbles to detect metastatic disease in the sentinel lymph nodes (SLNs) in swine model of naturally occurring melanoma. The SLN is the first lymph node in the lymphatic chain draining primary tumor, and early detection of metastatic SLN involvement is critical in the appropriate management of melanoma. PROCEDURE Nine Sinclair swine (weight 3-7 kg; Sinclair BioResources, Columbia, MO, USA) with naturally occurring melanoma were examined. Siemens S3000 scanner with a 9L4 probe was used for imaging (Siemens Healthineers, Mountain View, CA). Dual-targeted contrast agent was created using Targestar SA microbubbles (Targeson, San Diego, CA, USA) labeled with ανβ3-integrin and P-selectin antibodies. Targestar SA microbubbles labeled with IgG-labeled were used as control. First, peritumoral injection of Sonazoid contrast agent (GE Healthcare, Oslo, Norway) was performed to detect SLNs. After that, dual-targeted and IGG control Targestar SA microbubbles were injected intravenously with a 30-min interval between injections. Labeled Targestar SA microbubbles were allowed to circulate for 4 min to enable binding. After that, two sets of image clips were acquired several seconds before and after a high-power destruction sequence. The mean intensity difference pre- to post-bubble destruction within the region of interest placed over SLN was calculated as a relative measure of targeted microbubble contrast agent retention. This process was repeated for non-SLNs as controls. All lymph nodes evaluated on imaging were surgically removed and histologically examined for presence of metastatic involvement. RESULTS A total of 43 lymph nodes (25 SLNs and 18 non-SLNs) were included in the analysis with 18 SLNs demonstrating metastatic involvement greater than 5 % on histology. All non-SLNs were benign. The mean intensity (± SD) of the dual-targeted microbubbles for metastatic SLNs was significantly higher than that of benign LNs (18.05 ± 19.11 vs. 3.30 ± 6.65 AU; p = 0.0008), while IgG-labeled control microbubbles demonstrated no difference in retained contrast intensity between metastatic and benign lymph nodes (0.39 ± 1.14 vs. 0.03 ± 0.24 AU; p = 0.14). CONCLUSIONS The results indicate that dual-targeted microbubbles labeled with P-selectin and ανβ3-integrin antibodies may aid in detecting metastatic involvement in SLNs of melanoma.
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Affiliation(s)
- Kibo Nam
- Department of Radiology, Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA, 19107, USA
| | - Maria Stanczak
- Department of Radiology, Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA, 19107, USA
| | - Flemming Forsberg
- Department of Radiology, Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA, 19107, USA
| | - Ji-Bin Liu
- Department of Radiology, Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA, 19107, USA
| | - John R Eisenbrey
- Department of Radiology, Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA, 19107, USA
| | | | - Andrej Lyshchik
- Department of Radiology, Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA, 19107, USA.
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Kusunose J, Caskey CF. Fast, Low-Frequency Plane-Wave Imaging for Ultrasound Contrast Imaging. Ultrasound Med Biol 2018; 44:2131-2142. [PMID: 30057134 PMCID: PMC6170006 DOI: 10.1016/j.ultrasmedbio.2018.05.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 05/23/2018] [Accepted: 05/24/2018] [Indexed: 05/07/2023]
Abstract
Plane-wave ultrasound contrast imaging offers a faster, less destructive means for imaging microbubbles compared with traditional ultrasound imaging. Even though many of the most acoustically responsive microbubbles have resonant frequencies in the lower-megahertz range, higher frequencies (>3 MHz) have typically been employed to achieve high spatial resolution. In this work we implement and optimize low-frequency (1.5-4 MHz) plane-wave pulse inversion imaging on a commercial, phased-array imaging transducer in vitro and illustrate its use in vivo by imaging a mouse xenograft model. We found that the 1.8-MHz contrast signal was about four times that acquired at 3.1 MHz on matched probes and nine times greater than echoes received on a higher-frequency probe. Low-frequency imaging was also much more resilient to motion. In vivo, we could identify sub-millimeter vasculature inside a xenograft tumor model and easily assess microbubble half-life. Our results indicate that low-frequency imaging can provide better signal-to-noise because it generates stronger non-linear responses. Combined with high-speed plane-wave imaging, this method could open the door to super-resolution imaging at depth, while high power pulses could be used for image-guided therapeutics.
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Affiliation(s)
- Jiro Kusunose
- Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Charles F Caskey
- Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Department of Radiology and Radiologic Sciences, Vanderbilt University Medical Center, Nashville, Tennessee, USA; Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, USA.
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Hiremath S, Kayibanda JF, Chow BJW, Fergusson D, Knoll GA, Shabana W, Lahey B, McBride O, Davis A, Akbari A. Drug discontinuation before contrast procedures and the effect on acute kidney injury and other clinical outcomes: a systematic review protocol. Syst Rev 2018; 7:34. [PMID: 29467030 PMCID: PMC5822653 DOI: 10.1186/s13643-018-0701-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 02/15/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Contrast-induced acute kidney injury (CI-AKI) is defined as worsening of renal function after the administration of iodinated contrast material. In patients with cardiovascular disease, kidney disease, and/or diabetes, renin-angiotensin system blockers, non-steroidal anti-inflammatory drugs, diuretics, and metformin can increase the risk of CI-AKI when undergoing contrast imaging. Despite CI-AKI being the leading iatrogenic cause of acute kidney injury, there is a lack of sufficient scientific evidence supporting which drugs should be stopped, when they should be stopped, and when they should be resumed. The purpose of this systematic review is to assess (1) the effect of withholding medication before contrast procedures on the risk of CI-AKI and other clinical outcomes and (2) the incidence of adverse events occurring after withholding these drugs prior to contrast procedures. This protocol has been registered with PROSPERO, https://www.crd.york.ac.uk/PROSPERO/display_record.asp?ID=CRD42016033178 . METHODS An information specialist will assist in searching MEDLINE, Embase, and the Cochrane Library databases to identify randomized controlled trials, observational studies, case reports, and case series. Relevant abstracts from professional society meetings and web-based registries of clinical trials will also be included. Studies included will compare patients aged ≥ 18 years instructed to continue taking the drugs of interest and those advised to stop taking them before undergoing contrast procedures. If these drugs are not withheld prior to contrast procedures, the studies must compare patients who are administered these drugs and those who are not before undergoing contrast procedures. Two reviewers will independently screen the titles and abstracts of the studies obtained from the search using pre-defined inclusion criteria and will then extract data from the full texts of selected studies. The quality of the studies will be assessed by two independent reviewers using the Cochrane Risk of Bias 2.0 tool for randomized trials and the Newcastle-Ottawa Scale for observational studies. DISCUSSION This systematic review will provide a synthesis of current evidence on the discontinuation of drugs prior to contrast procedures and its effect on CI-AKI and other clinical outcomes. These findings will provide clinicians with guidelines and serve as a strong research base for future studies in this field. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42016033178.
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Affiliation(s)
- Swapnil Hiremath
- The Ottawa Hospital and the University of Ottawa, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
| | | | - Benjamin J. W. Chow
- University of Ottawa Heart Institute, 40 Ruskin St, Ottawa, ON K1Y 4W7 Canada
| | - Dean Fergusson
- Ottawa Hospital Research Institute, Centre for Practice Changing Research, 1053 Carling Ave, Ottawa, ON K1Y 4E9 Canada
| | - Greg A. Knoll
- The Ottawa Hospital and the University of Ottawa, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
| | - Wael Shabana
- The Ottawa Hospital and the University of Ottawa, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
| | - Brianna Lahey
- Kidney Research Centre, The Ottawa Hospital, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
| | - Olivia McBride
- Kidney Research Centre, The Ottawa Hospital, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
| | - Alexandra Davis
- The Ottawa Hospital, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
| | - Ayub Akbari
- The Ottawa Hospital and the University of Ottawa, 1967 Riverside Drive, Ottawa, ON K1H7W9 Canada
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Lindsey BD, Shelton SE, Foster FS, Dayton PA. Assessment of Molecular Acoustic Angiography for Combined Microvascular and Molecular Imaging in Preclinical Tumor Models. Mol Imaging Biol 2017; 19:194-202. [PMID: 27519522 DOI: 10.1007/s11307-016-0991-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
PURPOSE The purposes of the present study is to evaluate a new ultrasound molecular imaging approach in its ability to image a preclinical tumor model and to investigate the capacity to visualize and quantify co-registered microvascular and molecular imaging volumes. PROCEDURES Molecular imaging using the new technique was compared with a conventional ultrasound molecular imaging technique (multi-pulse imaging) by varying the injected microbubble dose and scanning each animal using both techniques. Each of the 14 animals was randomly assigned one of three doses; bolus dose was varied, and the animals were imaged for three consecutive days so that each animal received every dose. A microvascular scan was also acquired for each animal by administering an infusion of nontargeted microbubbles. These scans were paired with co-registered molecular images (VEGFR2-targeted microbubbles), the vessels were segmented, and the spatial relationships between vessels and VEGFR2 targeting locations were analyzed. In five animals, an additional scan was performed in which the animal received a bolus of microbubbles targeted to E- and P-selectins. Vessel tortuosity as a function of distance from VEGF and selectin targeting was analyzed in these animals. RESULTS Although resulting differences in image intensity due to varying microbubble dose were not significant between the two lowest doses, superharmonic imaging had significantly higher contrast-to-tissue ratio (CTR) than multi-pulse imaging (mean across all doses 13.98 dB for molecular acoustic angiography vs. 0.53 dB for multi-pulse imaging; p = 4.9 × 10-10). Analysis of registered microvascular and molecular imaging volumes indicated that vessel tortuosity decreases with increasing distance from both VEGFR2- and selectin-targeting sites. CONCLUSIONS Molecular acoustic angiography (superharmonic molecular imaging) exhibited a significant increase in CTR at all doses tested due to superior rejection of tissue artifact signals. Due to the high resolution of acoustic angiography molecular imaging, it is possible to analyze spatial relationships in aligned microvascular and molecular superharmonic imaging volumes. Future studies are required to separate the effects of biomarker expression and blood flow kinetics in comparing local tortuosity differences between different endothelial markers such as VEGFR2, E-selectin, and P-selectin.
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Daeichin V, Bosch JG, Needles A, Foster FS, van der Steen A, de Jong N. Subharmonic, non-linear fundamental and ultraharmonic imaging of microbubble contrast at high frequencies. Ultrasound Med Biol 2015; 41:486-97. [PMID: 25592458 DOI: 10.1016/j.ultrasmedbio.2014.10.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 09/11/2014] [Accepted: 10/08/2014] [Indexed: 05/24/2023]
Abstract
There is increasing use of ultrasound contrast agent in high-frequency ultrasound imaging. However, conventional contrast detection methods perform poorly at high frequencies. We performed systematic in vitro comparisons of subharmonic, non-linear fundamental and ultraharmonic imaging for different depths and ultrasound contrast agent concentrations (Vevo 2100 system with MS250 probe and MicroMarker ultrasound contrast agent, VisualSonics, Toronto, ON, Canada). We investigated 4-, 6- and 10-cycle bursts at three power levels with the following pulse sequences: B-mode, amplitude modulation, pulse inversion and combined pulse inversion/amplitude modulation. The contrast-to-tissue (CTR) and contrast-to-artifact (CAR) ratios were calculated. At a depth of 8 mm, subharmonic pulse-inversion imaging performed the best (CTR = 26 dB, CAR = 18 dB) and at 16 mm, non-linear amplitude modulation imaging was the best contrast imaging method (CTR = 10 dB). Ultraharmonic imaging did not result in acceptable CTRs and CARs. The best candidates from the in vitro study were tested in vivo in chicken embryo and mouse models, and the results were in a good agreement with the in vitro findings.
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Affiliation(s)
- Verya Daeichin
- Biomedical Engineering, Thorax Center, Erasmus MC, Rotterdam, The Netherlands.
| | - Johan G Bosch
- Biomedical Engineering, Thorax Center, Erasmus MC, Rotterdam, The Netherlands
| | | | - F Stuart Foster
- Sunnybrook Research Institute and Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - Antonius van der Steen
- Biomedical Engineering, Thorax Center, Erasmus MC, Rotterdam, The Netherlands; Technical University Delft, Delft, The Netherlands
| | - Nico de Jong
- Biomedical Engineering, Thorax Center, Erasmus MC, Rotterdam, The Netherlands; Technical University Delft, Delft, The Netherlands; Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands
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