Objective(s): Size specific dose estimate (SSDE) is a new parameter that includes patient size factor in its calculation. Recent studies have produced mixed results on the utility of SSDE, especially when automatic exposure control (AEC) was used. The objective of the study was to find out if there is a relationship between patient size and each of the parameters, SSDE...

Semi−definite Embedding (SDE) is a recently proposed to maximize the sum of pair wise squared distances between outputs while the input data and outputs are locally isometric, i.e. it pulls the outputs as far apart as possible, subject to unfolding a manifold without any furling or fold for unsupervised nonlinear dimensionality reduction. The extensions of SDE to supervised feature extraction, ...

The dose received by a patient on CT examination is expressed in size-specific estimates (SSDE) which function of the diameter, x-ray attenuation, and scanner output (volume computed tomography index, CTDIvol). Patient diameter attenuation are represented as water equivalent (Dw). We conducted research to analyze relationships between body weight Dw, CTDIvol, contrast-enhanced thorax examinatio...

This study proposed to determine whether in vivo iodine concentration measurement by single-source dual energy (SSDE) CT can improve differentiation between benign and malignant thyroid nodules. In total, 53 patients presenting with thyroid nodules underwent SSDE CT scanning. Iodine concentrations were measured for each nodule and normal thyroid tissue using the GSI-viewer image analysis softwa...

OBJECTIVES To compare the effectiveness of two different patient size metrics based on water equivalent diameter (Dw ), the mid-scan water equivalent diameter Dw_c , and the mean (average) water equivalent diameter in the imaged region, Dw_ave , for automatic detection of accidental changes in computed tomography (CT) acquisition protocols. METHODS Patient biometric data (height and weight) w...

This phantom study was designed to compare the radiation dose in thoracic and abdomen-pelvic CT scans with and without use of tube current modulation (TCM). Effective dose (ED) and size-specific dose estimation (SSDE) were calculated with the absorbed doses measured at selective radiosensitive organs using a thermoluminescence dosimeter-100 (TLD-100). When compared to protocols without TCM, the...

The Email systems are playing an important and irreplaceable role in the digital world due to its convenience, efficiency and the rapid growth of World Wide Web (WWW). However, most of the email users nowadays are suffering from the large amounts of irrelevant and noisy emails everyday. Thus algorithms which can clean both the noise features and the irrelevant emails are highly desired. In this...

Telah dilakukan penelitian tentang penentuan besar dosis pasien pada Computed Tomography (CT) Scan kepala dengan metode Size Specific Dose Estimate (SSDE) dan faktor risiko terjadinya katarak. Nilai SSDE diperoleh dari data nilai Index Volume (CTDIvol), Anterior Posterior (AP) Lateral (LAT). Data 30 kelompok anak-anak usia 5-14 tahun dewasa 15-50 tahun. rata-rata untuk sebesar 52,387 mGy 49,664...

The purpose of this study is to reduce radiation dose for chest CT examination by including Tube Current Modulation (TCM) to a standard CT protocol. A scan of an anthropomorphic male Alderson phantom was performed on a 128-slice scanner. The estimation of effective dose (ED) in both scans with and without mAs modulation was done via multiplication of Dose Length Product (DLP) to a conversion fa...

Diagnostic Reference Level (DRL) is a method of optimizing patient doses in diagnostic and intervention procedures. The DRL value obtained from the Volumetric Computed Tomography Dose Index (CTDIvol) which phantom with diameter 16 cm or 32 cm, so it not yet possible to accurately estimate dose for each patient, especially pediatric patients. American Association Physicists Medicine (AAPM) then ...