Clinical Trials About "Iterative image reconstruction transcranial photoacoustic tomography based elastic" RSS

16:36 EST 21st February 2020 | BioPortfolio

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Showing "Iterative image reconstruction transcranial photoacoustic tomography based elastic" Clinical Trials 1–25 of 21,000+

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Laser-Based Photoacoustic Tomography of Human Inflammatory Arthritis

The purpose of this feasibility study is to determine if a new emerging technology called photoacoustic tomography (PAT) can be adapted for use in humans for the detection of chronic rheumatoid arthritis.

Use of Iterative Reconstruction Method in Ultralow-dose CT for Follow-up of Patients With Intraabdominal Abscess: Comparison With Standard Dose CT

Increasing radiation exposure by medical examinations is getting more concerns. For optimal medical imaging, reducing radiation exposure with preservation image quality is important. One of the solutions is use of iterative recontruction of CT examination. In this study, the investigators aimed to investigate the clinical feasibility of ultralow dose abdominopelvic CT with iterative reconstruction in patients with intraabdominal abscess. Patients with intrabdominal abscess usua...

Photoacoustic Imaging of the Breast in Patients With Breast Cancer and Healthy Subjects

This trial studies photoacoustic imaging of the breast in patients with breast cancer and healthy subjects. Dense breasts typically reduce the sensitivity of a mammography and also is associated with a higher risk of breast cancer. Photoacoustic tomography combines light and sound to provide more information about breast tissue.

Low-dose CT Angiography in the Detection of Acute Pulmonary Embolism: Validation in an Obese Population

Pulmonary embolism is a common pathology in the general population, whose suspicion is based on the clinical and dosage of D-dimers in particular. The key examination for the diagnosis of pulmonary embolism is chest CT angiography (negative predictive value of 98%). The evolution of machines in recent years allows a reduction of possible kilovoltage up to 80 kV, different computer algorithms (iterative reconstructions) to reconstruct the images and thus reduce the irrad...

Development of Photoacoustic Tomography

Cancer is one of the leading causes of death internationally. When planning treatment for most cancers, it is important to know how far it has spread, including whether or not the cancer has spread to the local lymph nodes (LNs) because this affects the treatment strategy. This is termed "staging", and can be achieved by medical imaging, such as by ultrasound, computed tomography (CT) or magnetic resonance imaging (MRI) scans. However, these are imperfect, and sometimes incorre...

C-arm Computed Tomography Scan Image Quality in Patients With Neurovascular Diseases

With new developments that have taken place in the optimization of C-arm computed tomography (CACT) image acquisition and reconstruction, CACT image quality will be better than current standard-of-care CACT scan techniques used for neurovascular patients referred to endovascular treatment or diagnosis. As such, novel acquisition, filtration, artifact reduction and reconstruction techniques will be evaluated against the standard-of-care CACT approach.

Photoacoustic Endoscopy of Barrett's Esophagus

Endoscopy is an important technique in medicine to diagnose internal organs. Video endoscopy has been the most common technique providing clear, real time video images of organs' surfaces. However, this technique only images the surface and cannot effectively diagnose diseased tissues that develop in endothelial tissues. Endoscopic ultrasound (EUS) has been developed to overcome this limitation, and it is widely utilized in diagnosing GI diseases. This technique can image very ...

Photoacoustic Imaging in Detecting Ovarian or Fallopian Tube Cancer

This pilot clinical trial studies how well photoacoustic imaging works in detecting ovarian or fallopian tube cancer. Photoacoustic imaging is an imaging method that uses lasers to light up tissue, and then converts the light information into ultrasound images. Photoacoustic imaging can provide images of the structure of tissues, as well as their function and the levels of molecules, such as the flow of blood in blood vessels and the level of oxygen in the blood. Photoacoustic ...


Low-dose Whole Body Computed Tomography Scanning

Computed tomography represents the mainstay for diagnosing various diseases in the whole body. Over the past decade, enormous efforts were undertaken by both CT manufacturers and radiologist to reduce the radiation dose to patients. Today, the dose is significantly lower that it was before the era of multislice CT and iterative reconstruction methods. The X-ray beam originating from the tube in a CT system contains a spectrum of different energies, whereby the "harder" beams wi...

Reduced Radiation Dose and IR-impact on Coronary Calcium Quantification

Evaluation of reduced radiation dose iterative reconstruction reconstructions for calcium scoring compared to full dose filtered back projection reconstructions

Dual-Energy CT on Plan Quality, Dose-delivery Accuracy, and Simulated Patient Outcomes for Locally Advanced Lung and Brain Tumor Patients Treated With Proton Therapy

The aim of this protocol is to refine the accuracy of proton beam therapy (PT) by the use of dual energy computed tomography (DECT), in conjunction with novel iterative image reconstruction algorithms, to more precisely determine the tissue properties through which the proton beam path travels.

Transvaginal Ultrasound and Photoacoustic Imaging of Ovary

This study is being conducted to validate if photoacoustic imaging potentially reduces benign surgeries without compromising cancer detection sensitivity. The study will also explore whether using the photoacoustic imaging/ultrasound technique has any potential with early ovarian cancer detection in a group of high risk patients.

Photoacoustic Lymph Node Imaging

In this spectroscopic photoacoustic imaging study, the investigators will acquire images (only) to: 1. determine if spectroscopic photoacoustic imaging can acquire high fidelity images in a clinical setting, 2. discover if blood oxygen saturation changes are observable in breast cancer patients during early stages of metastatic invasion, and 3. compare the sensitivity and specificity of photoacoustic imaging with ultrasound imaging for the de...

Thyroid Cancer and Photoacoustic Imaging

The aim of this study was to evaluate the usefulness of photoacoustic imaging in thyroid nodules. In addition, we would like to confirm the relationship between the results of photoacoustic imaging and histopathologic findings when thyroid nodules were diagnosed as thyroid cancer.

Ultrasound-Guided Photoacoustic Imaging for the Detection of Metastases in Inguinal Lymph Nodes

This early phase I trial studies how well ultrasound-guided photoacoustic imaging works in telling the difference between healthy and cancerous inguinal (groin) lymph nodes and how well it can detect certain features of lymph nodes, including size and shape in patients with cancer. Ultrasound-guided photoacoustic is a non-invasive imaging method that can detect and display characteristics of lymph nodes based on the level of oxygen in the cells. This imaging method may provide ...

Human Electrical-Impedance-Tomography Reconstruction Models

Current EIT analyses are based on the assumption of a circular thorax-shape and do not provide any information on lung borders. The aim is to obtain the body and lung border contours of male subjects by multi-detector computed tomography (MDCT) in defined thresholds of anthropometric data (gender = male; height; weight) for calibration of more realistic EIT reconstruction models.

Photoacoustic Imaging in Diagnosing Changes in Tumors in Participants With Breast Cancer, Sarcoma, Skin Cancer, or Soft Tissue Malignancy and Healthy Volunteers

This pilot trial studies how well photoacoustic imaging works in diagnosing changes in tumors in participants with breast cancer, sarcoma, skin cancer, or soft tissue malignancy and healthy volunteers. Photoacoustic imaging is a low-risk imaging method that provides information about the oxygenation of tissues using a combination of light and ultrasound techniques. Photoacoustic imaging uses a signal from hemoglobin to provide information on blood flow and oxygen levels, and it...

Depression and Body Image Distress Following Mastectomy With Reconstruction

Mastectomy is a major surgery that can have a profound effect on women's psychosocial wellbeing, including elevated depression and body image distress. Reconstructive breast surgery aims to improve patients' psychosocial adjustment to mastectomy, yet for some women substantial distress persists after reconstruction. However, very little is known about risk or protective factors for persistent depression or body image distress following mastectomy with reconstruction. The presen...

Deep-Learning Image Reconstruction in CCTA

Cardiac CT allows the assessment of the heart and of the coronary arteries by use of ionising radiation. Although radiation exposure was significantly reduced in recent years, further decrease in radiation exposure is limited by increased image noise and deterioration in image quality. Recent evidence suggests that further technological refinements with artificial intelligence allows improved post-processing of images with reduction of image noise. The present study aims at as...

A Clinical Study of TRUVIEW ART™(Advanced Reconstruction Tech)to Improve Image Quality on Chest Radiograph

To validate the following theory: "With TRUVIEW ART™ applied a detector's quantitative performance index, MTF(Modulation Transfer Function), is increased 20% or more". This is to examine the effect of the increased MTF index, whether it influences or not the interpreter's preference

Direct to Implant Breast Reconstruction Based Pre- or Retropectoral

The purpose of this study is to examine different outcomes of breast reconstruction in women who are treated for breast cancer with skin sparing mastectomy and subsequently a primary implant based reconstruction by one of two different techniques with either a pre- or retropectoral placement of the implant. The main objective of the study is to establish whether one of these techniques may result in a superior outcome and thus should be recommended as first choice treatment ra...

Photoacoustic Imaging for Measuring Tumors and Normal Tissue in Patients With Head and Neck Cancer

This trial studies how well photoacoustic imaging works in measuring tumors and normal tissue in patients with head and neck cancer. Photoacoustic imaging (PAI) is a low-risk imaging method that provides information about the oxygenation of tissues using a combination of light and ultrasound techniques. This study may help doctors determine if PAI is correlated with clinical responses of both tumor (for example: shrinking, swelling or disappearing) and normal tissues (for examp...

Evaluation of Full-field Coherence Tomography for ex Vivo Staging and Assessment of Superficial Esophageal Squamous Carcinoma: a Pilot Study

New tools are needed to 1) diagnose and 2) stage early esophageal squamous cell carcinoma (SCC) in order to improve outcomes of this frequent and lethal cancer. Optical coherence tomography (OCT) is an optical technique, which can image human tissue ex vivo and in vivo with a resolution around 30µm and with a depth of 1mm. Full-field optical coherence tomography (FFOCT) is a new modality, which allows to image an ex vivo specimen with a cellular resolution and to perform 3D r...

Transvaginal Ultrasound and Photoacoustic Imaging of the Ovary

The investigators have developed co-registered photoacoustic and ultrasound (US) imaging technique that allows the investigators to visualize tumor structure and functional changes simultaneously, which may potentially reveal early tumor angiogenesis development that is not available by US alone. The ability to detect early angiogenesis changes, as well as tumor morphology changes in the ovary, using a non-invasive imaging modality will greatly enhance the care for women.

Impact of Reconstruction Method (ASIR, FBP) Used in CT on Bone SPECT/CT Image Quality

The main objective of this study is to demonstrate the non-inferiority of SPECT image quality (as measured by the signal / noise ratio) obtained by ASIR reconstruction of very-low-dose CT acquisitions versus the quality of those obtained by filtered back projection (FBP) of low-dose CT acquisitions. The lower limit of non-inferiority is set to -1, the average SPECT signal / noise ratio TEMP expected is between 5 and 6.

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