scholarly journals Window-Modulated Compounding Nakagami Parameter Ratio Approach for Assessing Muscle Perfusion with Contrast-Enhanced Ultrasound Imaging

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3584
Author(s):  
Huang-Chen Lin ◽  
Shyh-Hau Wang
Keyword(s):  
Contrast Agents ◽  
Ultrasound Imaging ◽  
Ultrasound Contrast Agents ◽  
Muscle Disease ◽  
Contrast Enhanced Ultrasound ◽  
Time Intensity Curve ◽  
Muscle Perfusion ◽  
Ultrasound Contrast ◽  
Parameter Ratio ◽  
Contrast Enhanced

The assessment of microvascular perfusion is essential for the diagnosis of a specific muscle disease. In comparison with the current available medical modalities, the contrast-enhanced ultrasound imaging is the simplest and fastest means for probing the tissue perfusion. Specifically, the perfusion parameters estimated from the ultrasound time-intensity curve (TIC) and statistics-based time–Nakagami parameter curve (TNC) approaches were found able to quantify the perfusion. However, due to insufficient tolerance on tissue clutters and subresolvable effects, these approaches remain short of reproducibility and robustness. Consequently, the window-modulated compounding (WMC) Nakagami parameter ratio imaging was proposed to alleviate these effects, by taking the ratio of WMC Nakagami parameters corresponding to the incidence of two different acoustic pressures from an employed transducer. The time–Nakagami parameter ratio curve (TNRC) approach was also developed to estimate perfusion parameters. Measurements for the assessment of muscle perfusion were performed from the flow phantom and animal subjects administrated with a bolus of ultrasound contrast agents. The TNRC approach demonstrated better sensitivity and tolerance of tissue clutters than those of TIC and TNC. The fusion image with the WMC Nakagami parameter ratio and B-mode images indicated that both the tissue structures and perfusion properties of ultrasound contrast agents may be better discerned.

scholarly journals Recent Experiences and Advances in Contrast-Enhanced Subharmonic Ultrasound

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
John R. Eisenbrey ◽  
Anush Sridharan ◽  
Ji-Bin Liu ◽  
Flemming Forsberg
Keyword(s):  
Contrast Agents ◽  
Tumor Imaging ◽  
Three Dimensional ◽  
Ultrasound Contrast Agents ◽  
Surrounding Tissue ◽  
Contrast Enhanced Ultrasound ◽  
Ultrasound Contrast ◽  
Contrast Enhanced ◽  
Subharmonic Response

Nonlinear contrast-enhanced ultrasound imaging schemes strive to suppress tissue signals in order to better visualize nonlinear signals from blood-pooling ultrasound contrast agents. Because tissue does not generate a subharmonic response (i.e., signal at half the transmit frequency), subharmonic imaging has been proposed as a method for isolating ultrasound microbubble signals while suppressing surrounding tissue signals. In this paper, we summarize recent advances in the use of subharmonic imagingin vivo. These advances include the implementation of subharmonic imaging on linear and curvilinear arrays, intravascular probes, and three-dimensional probes for breast, renal, liver, plaque, and tumor imaging.

scholarly journals Molecular imaging of orthotopic prostate cancer with nanobubble ultrasound contrast agents targeted to PSMA

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu Wang ◽  
Al Christopher De Leon ◽  
Reshani Perera ◽  
Eric Abenojar ◽  
Ramamurthy Gopalakrishnan ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Ultrasound Imaging ◽  
Prostate Gland ◽  
Ultrasound Contrast Agent ◽  
Tumor Model ◽  
Focal Therapy ◽  
Ultrasound Contrast Agents ◽  
Time Intensity Curve ◽  
Ultrasound Contrast

AbstractUltrasound imaging is routinely used to guide prostate biopsies, yet delineation of tumors within the prostate gland is extremely challenging, even with microbubble (MB) contrast. A more effective ultrasound protocol is needed that can effectively localize malignancies for targeted biopsy or aid in patient selection and treatment planning for organ-sparing focal therapy. This study focused on evaluating the application of a novel nanobubble ultrasound contrast agent targeted to the prostate specific membrane antigen (PSMA-targeted NBs) in ultrasound imaging of prostate cancer (PCa) in vivo using a clinically relevant orthotopic tumor model in nude mice. Our results demonstrated that PSMA-targeted NBs had increased extravasation and retention in PSMA-expressing orthotopic mouse tumors. These processes are reflected in significantly different time intensity curve (TIC) and several kinetic parameters for targeted versus non-targeted NBs or LUMASON MBs. These, may in turn, lead to improved image-based detection and diagnosis of PCa in the future.

scholarly journals Honey, I shrunk the bubbles: microfluidic vacuum shrinkage of lipid-stabilized microbubbles

2021 ◽  
Author(s):  
Vaskar Gnyawali ◽  
Byeong-Ui Moon ◽  
Jennifer Kieda ◽  
Raffi Karshafian ◽  
Michael C. Kolios ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Ultrasound Imaging ◽  
Scale Up ◽  
Ultrasound Contrast Agents ◽  
Simple Approach ◽  
Vacuum Pressure ◽  
Flow Channels ◽  
Ultrasound Contrast ◽  
Microfluidic Flow ◽  
Microfluidic Technique

We present a microfluidic technique that shrinks lipidstabilized microbubbles from O(100) to O(1) µm in diameter–the size that is desirable in applications as ultrasound contrast agents. We achieve microbubble shrinkage by utilizing vacuum channels that are adjacent to the microfluidic flow channels to extract air from the microbubbles. We tune a single parameter, the vacuum pressure, to accurately control the final microbubble size. Finally, we demonstrate that the resulting O(1) µm diameter microbubbles have similar stability to microfluidics generated microbubbles that are not exposed to vacuum shrinkage. We anticipate that, with additional scale-up, this simple approach to shrink microbubbles generated microfluidically will be desirable in ultrasound imaging and therapeutics applications.

scholarly journals Time-intensity-curve Analysis and Tumor Extravasation of Nanobubble Ultrasound Contrast Agents

2019 ◽  
Vol 45 (9) ◽  
pp. 2502-2514 ◽  
Author(s):  
Hanping Wu ◽  
Eric C. Abenojar ◽  
Reshani Perera ◽  
Al Christopher De Leon ◽  
Tianzhi An ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Ultrasound Contrast Agents ◽  
Curve Analysis ◽  
Intensity Curve ◽  
Time Intensity Curve ◽  
Ultrasound Contrast

scholarly journals EFSUMB 2020 Proposal for a Contrast-Enhanced Ultrasound-Adapted Bosniak Cyst Categorization – Position Statement

2020 ◽  
Author(s):  
Vito Cantisani ◽  
Michele Bertolotto ◽  
Dirk-André Clevert ◽  
Jean-Michel Correas ◽  
Francesco Maria Drudi ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Task Force ◽  
Position Statement ◽  
Ultrasound Contrast Agents ◽  
Renal Lesions ◽  
Ultrasound Contrast ◽  
Contrast Enhanced ◽  
Enhanced Computed Tomography ◽  
Contrast Enhanced Computed Tomography ◽  
Cystic Renal Lesions

AbstractThe well-established Bosniak renal cyst classification is based on contrast-enhanced computed tomography determining the malignant potential of cystic renal lesions. Ultrasound has not been incorporated into this pathway. However, the development of ultrasound contrast agents coupled with the superior resolution of ultrasound makes it possible to redefine the imaging of cystic renal lesions. In this position statement, an EFSUMB Expert Task Force reviews, analyzes, and describes the accumulated knowledge and limitations and presents the current position on the use of ultrasound contrast agents in the evaluation of cystic renal lesions.

scholarly journals From Micro- to Nano-Multifunctional Theranostic Platform: Effective Ultrasound Imaging Is Not Just a Matter of Scale

2018 ◽  
Vol 17 ◽  
pp. 153601211877821 ◽  
Author(s):  
Sara Zullino ◽  
Monica Argenziano ◽  
Ilaria Stura ◽  
Caterina Guiot ◽  
Roberta Cavalli
Keyword(s):  
Diagnostic Imaging ◽  
Phase Change ◽  
Contrast Agents ◽  
Ultrasound Imaging ◽  
Tumor Tissue ◽  
Ultrasound Contrast Agents ◽  
Acoustic Droplet Vaporization ◽  
Droplet Vaporization ◽  
Enhanced Permeability And Retention ◽  
Ultrasound Contrast

Ultrasound Contrast Agents (UCAs) consisting of gas-filled-coated Microbubbles (MBs) with diameters between 1 and 10 µm have been used for a number of decades in diagnostic imaging. In recent years, submicron contrast agents have proven to be a viable alternative to MBs for ultrasound (US)-based applications for their capability to extravasate and accumulate in the tumor tissue via the enhanced permeability and retention effect. After a short overview of the more recent approaches to ultrasound-mediated imaging and therapeutics at the nanoscale, phase-change contrast agents (PCCAs), which can be phase-transitioned into highly echogenic MBs by means of US, are here presented. The phenomenon of acoustic droplet vaporization (ADV) to produce bubbles is widely investigated for both imaging and therapeutic applications to develop promising theranostic platforms.

scholarly journals Intraoperative Contrast-Enhanced Ultrasound for Brain Tumor Surgery

Neurosurgery ◽  
2014 ◽  
Vol 74 (5) ◽  
pp. 542-552 ◽  
Author(s):  
Francesco Prada ◽  
Alessandro Perin ◽  
Alberto Martegani ◽  
Luca Aiani ◽  
Luigi Solbiati ◽  
...  
Keyword(s):  
Brain Tumor ◽  
Real Time ◽  
Large Scale ◽  
Brain Lesion ◽  
Ultrasound Contrast Agent ◽  
Ultrasound Contrast Agents ◽  
Brain Lesions ◽  
Contrast Enhanced Ultrasound ◽  
Ultrasound Contrast ◽  
Contrast Enhanced

Abstract BACKGROUND: Contrast-enhanced ultrasound (CEUS) is a dynamic and continuous modality that offers a real-time, direct view of vascularization patterns and tissue resistance for many organs. Thanks to newer ultrasound contrast agents, CEUS has become a well-established, live-imaging technique in many contexts, but it has never been used extensively for brain imaging. The use of intraoperative CEUS (iCEUS) imaging in neurosurgery is limited. OBJECTIVE: To provide the first dynamic and continuous iCEUS evaluation of a variety of brain lesions. METHODS: We evaluated 71 patients undergoing iCEUS imaging in an off-label setting while being operated on for different brain lesions; iCEUS imaging was obtained before resecting each lesion, after intravenous injection of ultrasound contrast agent. A semiquantitative, offline interobserver analysis was performed to visualize each brain lesion and to characterize its perfusion features, correlated with histopathology. RESULTS: In all cases, the brain lesion was visualized intraoperatively with iCEUS. The afferent and efferent blood vessels were identified, allowing evaluation of the time and features of the arterial and venous phases and facilitating the surgical strategy. iCEUS also proved to be useful in highlighting the lesion compared with standard B-mode imaging and showing its perfusion patterns. No adverse effects were observed. CONCLUSION: Our study is the first large-scale implementation of iCEUS in neurosurgery as a dynamic and continuous real-time imaging tool for brain surgery and provides the first iCEUS characterization of different brain neoplasms. The ability of CEUS to highlight and characterize brain tumor will possibly provide the neurosurgeon with important information anytime during a surgical procedure.

Nanobubble–Affibody: Novel ultrasound contrast agents for targeted molecular ultrasound imaging of tumor

Biomaterials ◽  
2015 ◽  
Vol 37 ◽  
pp. 279-288 ◽  
Author(s):  
Hengli Yang ◽  
Wenbin Cai ◽  
Lei Xu ◽  
Xiuhua Lv ◽  
Youbei Qiao ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Ultrasound Imaging ◽  
Ultrasound Contrast Agents ◽  
Ultrasound Contrast ◽  
Molecular Ultrasound
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