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Reducing the radiation dose with the adaptive statistical iterative reconstruction technique for chest CT in adults： a parameter study

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Chinese Medical Journal 2014年第7期127卷 1284-1288页

作者： Liu Wenyun Ding Xiaobo Kong Boyu Fan Baoyan Chen Liang Department of Radiology The First Hospital of Jilin UniversityChangchun Jilin 130021 China

Background Currently there is a trend towards reducing radiation dose while maintaining image quality during computer tomography （CT） *** results from the concerns about radiation exposure from CT and the potential increase in the incidence of radiation induced *** study aimed to investigate the lowest radiation dose for maintaining good image quality in adult chest scanning using GE CT *** Seventy-two adult patients were examined by Gemstone Spectral *** were randomly divided into six *** set up a different value of noise index （NI） when evaluating each group every other number from 13.0 to *** original images were acquired with a slice of 5 mm *** each group,several image series were reconstructed using different levels of adaptive statistical iterative reconstruction （ASIR）（30％,50％,and 70％）.We got a total of 18 image sequences of different combinations of NI and ASIR *** one hand,quantitative indicators,such as CT value and standard deviation （SD）,were assessed at the region of *** signal-to-noise ratio （SNR） and contrast-to-noise ratio （CNR） were *** volume CT dose index （CTDI） and dose length product （DLP） were *** the other hand,two radiologists with ＞5 years of experience blindly reviewed the subjective image quality using the standards we had previously *** The different combinations of noise index and ASIR were *** was no significant difference in CT values among the 18 image *** SD value was reduced with the noise index＇s reduction or ASIR＇s *** was a trend towards gradually lower SNR and CNR with an NI *** CTDI and DLP were diminishing as the NI *** scores from subjective image quality evaluation were reduced in all groups as the ASIR *** Increasing NI can reduce radiation *** the premise of maintaining the same image quality,using a suitable percentage of ASIR can inc

关键词： chest computed tomography image quality noise index adaptive statistical iterative reconstruction

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Assessment of Traffic noise Pollution in Burla Town,India;An InclusiveAnnoyance Study

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Sound & Vibration 2020年第1期54卷 27-42页

作者： A.K.Sahu M.Pradhan C.R.Mohanty P.K.Pradhan department of mechanical engineering vssutburlaodisha768018india department of civil engineering pmecberhampurodisha761003india

noise pollution is one of the major public health problems in urban areas throughout the *** is unwanted sound which produces undesirable problems in day to day life of human being(e.g.,physiological and psychological problems).Rapid increase of the industrialization,urbanization,infrastructure,volume of motor vehicles,and increase in the road networks brought noise pollution to the highest level of disaster in a current *** urban areas,road traffic noise plays commanding role among all noise sources and affects the exposed *** present work is done to evaluate and assess the traffic noise and its effects in Burla ***,Vidyanagari of Odisha,is an emerging town in India,as it hosts national level of teaching and research institutions like IIM Sambalpur,a medical college-cum-hospital(VIMSAR),a technical university(VSSUT)and Sambalpur *** last two decade,the road traffic volume has been increased and is facing severe noise pollution to its *** pollution assessment was made at different locations of the *** study unveiled the dismal state of noise pollution in the *** contour maps were drawn to visualize the noise level at the traffic and its *** numbers of hearing impaired patients in different hospitals of the locality are *** shows grim picture of the *** equations were established taking noise levels with percentage of highly annoyed people during study indicates strong correlation.

关键词： Equivalent continuous noise level traffic noise noise index noise climate noise standards annoyance

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