Investigation of Structural, SEM, TEM and Dielectric Properties of BaTiO3 nanoparticles

BaTiO3 nanoparticles were prepared by solvothermal method. The X-ray diffraction (XRD) analysis was used to study the structure and crystallite size of BaTiO3 nanoparticles. The morphology and the size of the BaTiO3 nanoparticles were characterized using scanning and transmission electron microscopy (SEM and TEM). The optical properties were studied using the UV-Visible spectrum in the wavelength range of 300-800 nm. The dielectric properties of BaTiO3 nanoparticles were studied for different frequencies and different temperatures. The AC electrical conductivity study revealed that the conduction depended both on the frequency and the temperature

Elemental, structural and optical properties of Cd1-xCoxS thin films prepared by spray pyrolysis technique

The Cd1-xCoxS (x=0.00, 0.10, 0.20 and 0.40) thin films were deposited onto glass substrate at temperature 523K by using a low cost spray pyrolysis deposition (SPD) technique. The deposited films have been characterized their elemental, structural and optical properties measurements by energy dispersive X-ray, X-ray diffraction and UV-VIS spectrophotometer. Energy dispersive X-ray (EDX) analysis confirmed the presence of Cd, S and Co compositions in the films with appropriate stoichiometric. The as deposited films were amorphous in nature. The optical band gap of the films was decreased from 2.54 eV to 2.40 eV. Refractive index and the refractive index were affected by the doping concentration. Keywords: SEM, spray pyrolysis, band gap and solar cellThe research is financed by Bangladesh University of Engineering and Technology (BUET),.Dhaka-1000, Bangladesh

Precision grid and hand motion for accurate needle insertion in brachytherapy

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/98741/1/MPH004749.pd

Update on diagnosis and treatment of actinic keratosis

Actinic keratosis (AK) is a relatively common skin condition occurring due to chronic sun-exposure, primarily affecting fair skin. Most dermatologists consider it an incipient malignancy due to its risk of full-blown malignant transformation to squamous cell carcinoma. However, the exact risk factors remain unknown, and thus its course cannot be predicted. Therefore, all cases of AK need early diagnosis and appropriate treatment to mitigate this risk. Over the years, several noninvasive diagnostic techniques such as dermoscopy, reflectance confocal microscopy, and newer treatment modalities (lesion-directed and field-directed) have been introduced with their own set of advantages and disadvantages. Notably, invasive skin biopsy with histopathology remains the gold-standard for diagnosis. Prevention is of paramount importance, highlighted by adequate sun-protection measures. This article reviews the diagnostic and treatment modalities of AK, with their latest updates, to optimize patient management

Dosimetric Evaluation of Tumor Tracking in 4D Radiotherapy

Purpose: In some patients the tumors in lung, pancreas, liver, breast, and other organs move significantly during cardiac and breathing cycles. In this study we have investigated the dosimetric benefits of real-time tumor tracking for patients who were diagnosed with lung cancer. American Society for Therapeutic Radiation Oncology (ASTRO) 52nd Annual Meeting October 31 - November 4, San Diego, C

Robot-Assisted Prostate Brachytherapy

Abstract: In contemporary brachytherapy procedures, needle placement at the desired target is challenging due to a variety of reasons. A robot-assisted brachytherapy system can potentially improve needle placement and seed delivery, resulting in enhanced therapeutic delivery. In this paper we present a 16 DOF (degrees-of-freedom) robotic system (9DOF positioning module and 7DOF surgery module) developed and fabricated for prostate brachytherapy. Strategies to reduce needle deflection and target movement were incorporated after extensive experimental validation. Provisions for needle motion and force feedback were included into the system for improving robot control and seed delivery. Preliminary experimental results reveal that the prototype system is sufficiently accurate in placing brachytherapy needles

Performance Study of Novel Accelerationenhanced Filters in the Prediction of Normal and Irregular Respiration Motion

Purpose: To study the performance of the novel acceleration-enhanced (AE) filters in the prediction of normal and irregular respiration motion and compare them with those of traditional adaptive normalized least mean squares (nLMS) and adaptive neuron network (ANN) filters. This facilitates the real-time tumor tracking and dynamic delivery of radiation dose to the tumor. American Association of Physicists in Medicine (AAPM) 52nd Annual Meeting July 18-22, Philadelphia, P

Dosimetric Advantages of Active Tracking and Dynamic Dose Delivery

Purpose: To investigate dosimetric effect of tumor tracking. To evaluate changes of treatment volumes when tracking is applied. American Association of Physicists in Medicine (AAPM) 52nd Annual Meeting July 18-22, Philadelphia, PA