PURPOSE To investigate a technique for optimizing radiation dose and image quality for a computed radiography system. METHODS Entrance skin doses were measured for phantom models of the pelvis and lumbar spine imaged using the vendor's recommended exposure settings (ie, the reference doses) as well as doses above and below the vendor's recommended settings for both body parts. Images were ass...

α-Ga2O3 has the corundum structure analogous to that of α-Al2O3. The bandgap energy is 5.3 eV and greater than β-Ga2O3, making α-phase attractive for devices benefit from its wider bandgap. O–H O–D centers produced by implantation H+ D+ into have been studied infrared spectroscopy complementary theory. An line at 3269 cm−1 assigned H complexed with a Ga vacancy (VGa), similar case trapped an Al...

Tarihi yansıtan kamusal alanlar, insanların geçmiş ve gelecek arasında bağlantı kurmasını sağlamaktadır. Kentlinin tarihi belleğini şekillendiren, kentin kimliğini oluşturan alanların görünürlüğü mekân algısı kullanımı bakımından önemlidir. Bu araştırmanın amacı yapılarının çevresinde yer alan park tasarımında analiz ederek, görünür alanın tasarım kurgusuyla bütünleşme durumunu saptamaktır. Çal...

Abstract A real-time 3-D image sensor with VGA (640 × 480) resolution based on triangulation is presented. The sensor employs an adaptive thresholding circuit and column-parallel time-domain approximate ADCs to realize high-speed readout for real-time range finding. Sub-pixel position calculation based on intensity profile by the readout scheme achieves high-accuracy range finding. A column-par...

OBJECTIVE To evaluate three image acquisition presets for four-dimensional cone beam CT (CBCT) to identify an optimal preset for lung tumour image quality while minimizing dose and acquisition time. METHODS Nine patients undergoing radical conventionally fractionated radiotherapy for lung cancer had verification CBCTs acquired using three presets: Preset 1 on Day 1 (11 mGy dose, 240 s acquisi...

ETRI Journal, Volume 28, Number 3, June 2006 ABSTRACT—Monolithic SiGe heterojunction bipolar transistor (HBT) variable gain amplifiers (VGAs) with a feedforward configuration have been newly developed for 5 GHz applications. Two types of the feedforward VGAs have been made: one using a coupled-emitter resistor and the other using an HBT-based current source. At 5.2 GHz, both of the VGAs achieve...

This paper presents a novel variable gain amplifier (VGA) design which is applied in the automatic gain control (AGC) loop of DVB-T/H receivers. The VGA composed of three cascaded tunable gain stages to provide a 70 dB dynamic range with 2 dB gain steps. Each gain stage is based on a digital variable gain amplifier (DVGA) which is composed of a plurality of gain blocks (GBs) and a fully differe...