#Xact loan reviews series#

Results: For imaging a breast with large size (16cm in diameter at chest wall), the photon energy of X-ray source and the central frequency of ultrasound detector is determined as 20keV and 5.5MHz. Breast XACT images are reconstructed from the recorded time-dependent ultrasound waves. Then, the X-ray induced acoustic wave propagation is simulated by K-WAVE toolkit. The initial pressure rise caused by X-ray energy deposition is calculated according to tissue properties. X-ray dose deposition in each pixel is calculated based on the tissue type by using GEANT4 Monte Carlo toolkits. HU value based segmentation ismoreÂ Â» done to distinguish the skin, adipose tissue, glandular tissue, breast calcification, and chest bone from each CT image.

#Xact loan reviews series#

A series of breast CT image along the coronal plane from a patient with calcifications in the breast tissue are used as the source image. Methods: Theoretical calculations are done to determine the appropriate X-ray energy and ultrasound frequency in breast XACT imaging. Applying this innovative technology to breast imaging, an X-ray exposure can generate a 3D acoustic image, which dramatically reduces the radiation dose to patients when compared to conventional breast CT. We have designed a new imaging paradigm, X-ray induced acoustic computed tomography ( XACT). Purpose: Exposure to radiation increases the risk of cancer. TH-AB-209-08: Next Generation Dedicated 3D Breast Imaging with XACT Therefore, with the proposed innovative technology, one can potentially reduce radiation dose to patient in breast imaging as compared with current x-ray modalities. Reconstruction result shows that breast calcification with diameter of 80 Î¼m can be observed in XACT image by using ultrasound transducers with 5.5 MHz center frequency. The radiation dose can be reduced by a factor of 100 compared with the newly FDA approved breast CT. The final detection sensitivity is primarily limited by the thermal noise. Theoretical analysis shows that the X-ray induced acoustic signal has a 100% relative sensitivity to the X-ray absorption (given that the percentage change in the X-ray absorption coefficient yields the same percentage change in the acoustic signal amplitude), but not to X-ray scattering. Furthermore, K-Wave simulation is employed to study the acoustic wave propagation in breast tissue. A noise equivalent pressure model is used for calculating the minimal radiation dose in XACT imaging. A theoretical model is developed to analyze the sensitivity of XACT. Applying this innovative technology to breast imaging, one single X-ray exposure can generate a 3D acoustic image, which dramatically reduces the radiation dose to patients when compared to beast CT. We present the concept and design of a new imaging paradigm, X-ray induced acoustic computed tomography ( XACT). Tang, Shanshan Ren, Liqiang Samant, Pratik Chen, Jian Liu, Hong Xiang, LiangzhongĮxcessive exposure to radiation increases the risk of cancer. Sub-mSV breast XACT scanner: concept and design Our study is the first to report on endoscopic endonasal repair of CSF leaks using DuraSeal. The system was effective in the majority of patients. We used DuraSeal in five patients to enhance graft strength and form a watertight seal. There are a variety of techniques described to repair CSF rhinorrhea, with various studies demonstrating the advantages of using tissue glues in CSF leak repairs. Comparison to a subset of patients using Tisseel Fibrin Sealant (Baxter, Toronto, ON) for repair did not show a significant difference in failure rate (Ï‡2 = 0.029, p =. There were no complications related to DuraSeal use.

In four of the five cases, the repair was successful. Five cases were identified that met study criteria. Demographic data and operative reports were collected and analyzed qualitatively. A database of endoscopic skull-base cases between 20 that involved CSF leakage repaired with DuraSeal was created. The purpose of our article is to review the use of the DuraSeal Sealant System (Confluent Surgical Inc., Waltham, MA) in the repair of complex cerebrospinal fluid (CSF) leaks in endoscopic skull-base surgery. Use of duraseal in repair of cerebrospinal fluid leaks.Ĭhin, Christopher J Kus, Lukas Rotenberg, Brian W