scholarly journals Frequency Domain Compressive Sampling for Ultrasound Imaging

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Céline Quinsac ◽  
Adrian Basarab ◽  
Denis Kouamé
Keyword(s):  
Ultrasound Imaging ◽  
Applied Mathematics ◽  
Low Frequency ◽  
Compressive Sampling ◽  
Recent Theory ◽  
Ultrasound Images ◽  
Resonance Imaging ◽  
Low Frequency Ultrasound ◽  
2D And 3D ◽  
Frequency Ultrasound

Compressed sensing or compressive sampling is a recent theory that originated in the applied mathematics field. It suggests a robust way to sample signals or images below the classic Shannon-Nyquist theorem limit. This technique has led to many applications, and has especially been successfully used in diverse medical imaging modalities such as magnetic resonance imaging, computed tomography, or photoacoustics. This paper first revisits the compressive sampling theory and then proposes several strategies to perform compressive sampling in the context of ultrasound imaging. Finally, we show encouraging results in 2D and 3D, on high- and low-frequency ultrasound images.

Low-frequency ultrasound and photochromotherapy in the complex treatment of patients with chronic bacterial and viral rhinosinusitis

2020 ◽  
pp. 13-23
Author(s):  
Natalya Kornova ◽  
A. Krylov
Keyword(s):  
Chronic Rhinosinusitis ◽  
Low Frequency ◽  
Chronic Tonsillitis ◽  
Complex Treatment ◽  
Resonance Imaging ◽  
X Ray ◽  
Low Frequency Ultrasound ◽  
Viral Nature ◽  
Ig G ◽  
Frequency Ultrasound

The article presents results of a study on the effectiveness of using lowfrequency ultrasound and photochromotherapy in the complex treatment of patients with chronic bacterial and viral rhinosinusitis. The study involved 69 people aged 18 to 55 years: 39 (56.83 %) women and 30 (45.11 %) men with chronic rhinosinusitis during the period of clinical exacerbation and concomitant chronic tonsillitis without exacerbation. All patients included in the study underwent X-ray examination or computed tomography and magnetic resonance imaging of the paranasal sinuses. 100 % of the patients were examined for the presence of antibodies to Human gammaherpesvirus 4 (ELISA), had study of blood serum for IgM and IgG and test to determine the avidity of Ig G antibodies to γ-herpesviruses. The obtained data indicate the effectiveness of including low-frequency ultrasound and photochromotherapy in the complex treatment of patients with chronic rhinosinusitis and concomitant chronic tonsillitis of bacterial and viral nature without exacerbation.

scholarly journals Ultrasound cavitation enhanced chemotherapy: In vivo research and clinical application

2020 ◽  
Vol 245 (14) ◽  
pp. 1200-1212
Author(s):  
Zhiyong Shen ◽  
Jingjing Shao ◽  
Jianquan Zhang ◽  
Weixing Qu
Keyword(s):  
Nude Mice ◽  
Malignant Tumors ◽  
Case Reports ◽  
Low Frequency ◽  
Carcinoma Cells ◽  
Resonance Imaging ◽  
Tumor Tissues ◽  
Low Frequency Ultrasound ◽  
Frequency Ultrasound

Ultrasound and microbubbles can induce apoptosis of tumor cells. However, the effects of ultrasound and microbubbles (USMB) combined with chemotherapy on in vivo tumors have rarely been studied. This research is to evaluate the efficacy of targeted USMB and chemotherapeutic drugs on apoptosis and inhibition of hepatic carcinoma cells in nude mice. We also summarize case reports of its clinical application. It was divided into three parts: First, the subcutaneous hepatic tumors of nude mice were irradiated with ultrasound (20 kHz, 2 W/cm2, 40% duty cycle) and SonoVue microbubbles injected to the tail vein of the mice followed by chemotherapy comprising cisplatin, mitomycin, and 5-fluorouracil. The apoptosis of hepatoma cells was examined by TUNEL staining, and the expression of the Bax and Bcl-2 proteins in the tumor tissues was detected by immunohistochemistry. The microvasculature of the tumor tissues was observed by transmission electron microscope. Second, orthotopic hepatic tumors in nude mice were irradiated by USMB and chemotherapy. The therapeutic effects were evaluated by magnetic resonance imaging. Third, the malignant tumors in three patients were treated with USMB and chemotherapy. Our results showed that microbubbles focused by low-frequency US ruptured microvessel walls, through which more chemotherapy drugs entered into the carcinoma cells, thus enhancing cell apoptosis, increasing Bax protein expression, and decreasing Bcl-2 expression. The survival period of the nude mice in the USMB and chemotherapy group was the longest, compared with the control, USMB, and chemotherapy (χ2=29.37, P < 0.0001). Magnetic resonance imaging examinations revealed the tumor volumes in nude mice decreased after USMB and chemotherapy (t = 3.91, P = 0.0173). In clinical cases, after USMB and chemotherapy, the diameters of tumors decreased and the symptoms of the patients were relieved. Targeted low-frequency ultrasound combined with chemotherapy can promote tumor cell apoptosis, inhibit tumor growth, and relieve clinical symptoms of patients. Impact statement The novelty of this research is that we used ultrasound cavitation to enhance the effects of chemotherapy in the subcutaneous and orthotopic hepatic carcinomas in nude mice. Case reports of the effects of the targeting ultrasound cavitation and chemotherapy on malignant tumors in clinical patients were also examined. We found that low-frequency ultrasound cavitation combined with chemotherapy is effective in the inhibition of tumor growth to some extent.

Application of Low‐Frequency Ultrasound for Intensified Biodiesel Production Process

2021 ◽  
pp. 59-84
Author(s):  
Mohd Razealy Anuar ◽  
Mohamed Hussein Abdurahman ◽  
Nor Irwin Basir ◽  
Ahmad Zuhairi Abdullah
Keyword(s):  
Production Process ◽  
Low Frequency ◽  
Biodiesel Production ◽  
Low Frequency Ultrasound ◽  
Frequency Ultrasound

The comparative study of high- and low-frequency ultrasound therapy on bone regeneration

2003 ◽  
Vol 29 (5) ◽  
pp. S120-S121
Author(s):  
S. Bashardoust Tajali ◽  
S. Kazemi ◽  
A. Azari ◽  
A. Shahverdi ◽  
M. Jabal Ameli
Keyword(s):  
Comparative Study ◽  
Bone Regeneration ◽  
Low Frequency ◽  
Ultrasound Therapy ◽  
Low Frequency Ultrasound ◽  
The Comparative Study ◽  
Frequency Ultrasound
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