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Simultaneous acquisition of CT angiography and whole brain CT perfusion images by using multiphase dynamichelical scan on 16 MDCT

Weiwei CHEN, Jianpin QI, Wenzhen ZHU, Wenhua HUANG, Jinmei SONG

Frontiers of Medicine 2009, Volume 3, Issue 2,   Pages 230-235 doi: 10.1007/s11684-009-0023-8

Abstract: We implemented a new protocol — multiphase dynamic helical scan to acquire CT angiography (CTA) and wholebrain CT perfusion (CTP) images simultaneously with single scan on 16 multidetector CT (MDCT).Each group underwent CT scan by using the new protocol, traditional CTA and CTP protocol, respectivelyThe volume CT dose index (CTDIvol) and dose length product (DLP) of our protocol were lower than the

Keywords： computed tomography angiography     computed tomography perfusion    

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A pilot study on Paxlovid therapy for hemodialysis patients with severe acute respiratory syndrome coronavirus 2 infections

Frontiers of Medicine doi: 10.1007/s11684-023-1011-0

Abstract: Laboratory parameters and chest CT (computed tomography) imaging were analyzed.patients progressed to moderate disease, and none in the treatment group showed progression of chest CT

Keywords： Paxlovid     hemodialysis     SARS-CoV-2     viral load     chest CT scan    

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Trauma-induced “Macklin effect” with pneumothorax and large pneumomediastinum, disguised by allergy

Salomone Di Saverio, Kenji Kawamukai, Andrea Biscardi, Silvia Villani, Luca Zucchini, Gregorio Tugnoli

Frontiers of Medicine 2013, Volume 7, Issue 3,   Pages 386-388 doi: 10.1007/s11684-013-0278-y

Abstract: Subsequent chest CT scan showed a small left pneumothorax and a large amount of air in the mediastinum

Keywords： thoracic trauma     differential diagnosis     critical care     pneumothorax     pneumomediastinum     CT scan     pitfalls    

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Efficient scheme of low-dose CT reconstruction using TV minimization with an adaptive stopping strategy Article

Yong DING, Tuo HU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2001-2008 doi: 10.1631/FITEE.1700287

Abstract: Recently, low-dose computed tomography (CT) has become highly desirable because of the growing concernFor low-dose CT imaging, it is a significant challenge to guarantee image quality while reducing radiationTo promote low-dose CT imaging, we propose a promising reconstruction scheme which combines total-variationin terms of image quality and computational efficiency, which validates its potential for low-dose CT

Keywords： Low-dose computed tomography (CT)     CT imaging     Total variation     Sparse dictionary learning    

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Low-dose CT for lung cancer screening: opportunities and challenges

Hongbing Shen

Frontiers of Medicine 2018, Volume 12, Issue 1,   Pages 116-121 doi: 10.1007/s11684-017-0600-1

Abstract:

Lung cancer is among the most frequently diagnosed cancers worldwide and the leading cause of cancer death in both males and females. Screening for lung cancer coupled with earlier intervention has long been studied as an approach to mortality reduction. However, minimal progress was achieved until recently, when low-dose spiral computed tomography (LDCT) screening demonstrated a 20% reduction in mortality from lung cancer in a randomized controlled trial (RCT), the National Lung Screening Trial, from the United States. On the basis of this finding, LDCT has been recommended for lung cancer screening in high-risk populations by several clinical guidelines. However, results from the following independent RCTs in Europe failed to show consistent conclusions. In addition, intractable problems gradually emerged with the progress of LDCT screening. This paper summarizes and discusses the main observations and challenges of LDCT screening for lung cancer. Before spreading implementation of LDCT screening, challenges, including high false-positive rates, overdiagnosis, enormous costs, and radiation risk, must be addressed. Complementary biomarkers and technical improvement are expected in the field of lung cancer screening in the near future.

Keywords： lung cancer     low-dose computerized tomography     early detection     opportunities     challenges    

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A Motion-Adaptive Algorithm for Video Scan Format Conversion and the Hardware Implementation

Zhang Guanglie,Zheng Nanning,Wu Yong,Zhang Xia

Strategic Study of CAE 2001, Volume 3, Issue 6,   Pages 41-47

Abstract: >Along with the development of digital processing TV and new-generation TV fully digitalized, video scannoise-reduced filter with edge-preserved into motion adaptive deinterlacing algorithm, a new algorithm for scan

Keywords： scan format conversion     motion adaptive deinterlacing     edge-preserved noise-reduced filter    

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The dynamic correction of collimation errors of CT slicing pictures

LIU Ya-xiong, Sekou Sing-are, LI Di-chen, LU Bing-heng

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 168-172 doi: 10.1007/s11465-006-0016-0

Abstract: To eliminate the motion artifacts of CT images caused by patient motions and other related errors, twoconfirm that the correction method with any of the correctors can improve the accuracy and reliability of CT
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A New Adaptive Frame Rate Upconversion Algorithm for Scan Rate Conversion and Its FPGA Implementation

Wu Yong,Zhang Guanglie,Zheng Nanning,Zhang Xia

Strategic Study of CAE 2001, Volume 3, Issue 4,   Pages 56-62

Abstract: a look-up table that corresponds to the adjustable parameter and employing FPGA, the algorithm for scan

Keywords： scan format conversion     frame rate up-conversion     block-matching     motion compensation    

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A Video Scan Format Conversation Algorithm Based onSpatio-temporal Weight and Edge Direction

Ding Yong,Lu Shengli,Shi Longxing

Strategic Study of CAE 2007, Volume 9, Issue 10,   Pages 49-54

Abstract:

De-interlace is to convert interlaced images to progressive ones.  In this paper,  a de-interlacing algorithm based on spatio-temporal weight and edge direction is presented.  It consists of motion detection,  low-angle edge detection,  and spatio-temporal weight adaptive interpolation.  It uses total 4 fields information captured in field storage to detect the presence of motion.  And it detects low-angle edge by an adaptive searching radius in which the 6°edge is obtained.  The proposed method using spatio-temporal adaptive interpolation can obtain quite good display quality and satisfies real-time process of HDTV sequences.

Keywords： scan format conversation     motion estimation     edge detection     spatio-temporal adaptive interpolation    

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Analyzing the characterization of pore structures and permeability of diesel contaminated clays under different aging conditions

Frontiers of Structural and Civil Engineering   Pages 1264-1280 doi: 10.1007/s11709-023-0921-x

Abstract: In this study, mercury intrusion porosimetry (MIP) and X-ray micro-computed tomography (XRμCT) were usedThe XRμCT analysis yielded consistent results; it showed that aging renders pores more spherical andThe combination of MIP and XRμCT provided a comprehensive and reliable characterization of the soil pore

Keywords： MIP     XRμCT     aging     diesel content     pore structure     permeability characteristics    

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Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 369-376 doi: 10.1007/s11465-018-0489-7

Abstract: This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigue loading. Crack growth experiments were performed on compact tension specimens using trapezoidal waveform with dwell time at the maximum load at 650 °C. The crack growth rate of GH4169 superalloy significantly increased with dwell time. The grain boundaries oxidize during the dwell process, thereby inducing an intergranular creep-fatigue fracture mode. In addition, testing data under the same dwell time showed scattering at the crack growth rate. Consequently, a modified model based on the Saxena equation was proposed by introducing a distribution factor for the crack growth rate. Microstructural observation confirmed that the small grain size and high volume fraction of the d phase led to a fast creep-fatigue crack growth rate at 650 °C, thus indicating that two factors, namely, fine grain and presence of the d phase at the grain boundary, increased the amount of weakened interface at high temperature, in which intergranular cracks may form and propagate.

Keywords： crack growth rate     creep-fatigue     GH4169 superalloy     CT specimen     dwell time    

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Comparison of CT-guided aspiration to key hole craniotomy in the surgical treatment of spontaneous putaminal

ZHAO Jizong, WANG Dejiang, WANG Shuo, YUAN Ge, KANG Shuai, JI Nan, ZHAO Yuanli, YE Xun, ZHOU Liangfu, ZHOU Dingbiao, WANG Renzhi, WANG Mei

Frontiers of Medicine 2007, Volume 1, Issue 2,   Pages 142-146 doi: 10.1007/s11684-007-0027-1

Abstract: This study was designed to compare the approaches and efficacies of two different ways of neurosurgical management for spontaneous putaminal hemorrhage (SPH): computed tomographic-guided aspiration (CTGA) and the key-hole approach (KHA). The indications of the two approaches are also explored. From September 2001 to 2003, a total of 1077 cases of SPH distributed in 135 hospitals all over the mainland of China were included for analysis. All cases had three-month follow-up data. The study was designed in a single-blinded manner to compare the efficacies of the different approaches. There were 563 cases in the CTGA group, 165 in the KHA group, and 217 cases in the conventional open craniotomy (COC) group. In the CTGA and KHA groups, the mortalities at one month after operation (M1m) were 17.9% and 18.3%, respectively, while the mortalities at three months after operation (M3m) were 19.4% and 19.4%, respectively (>0.05). The postoperative complications due to CTGA (23.7%) were not significantly different from those due to KHA (25.7%) ( = 0.420). The M3m of patients with Glasgow coma scale (GCS) "d8 was 3.45 and 4.0 times as much as those with GCS>8, respectively. The M3m of patients with complications was 3.92 times as much as those without complications. The M3m of patients with hemorrhage volume "e70 mL was 2.67 times as much as those <70 mL. The CTGA is not better than KHA in the treatment of SPH in terms of a more favorable outcome or less mor tality and morbidity, but CTGA could be the first choice for those with bleeding volumes "d50mL, while KHA is the first choice for those with bleeding volumes >50 mL.

Keywords： tomographic-guided aspiration     single-blinded manner     favorable outcome     operation     Glasgow    

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A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 89-101 doi: 10.1007/s11709-013-0197-7

Abstract: of this paper is to propose a new quality evaluation method for asphalt concrete mixture using X-ray CTscanning; 4) frequency of CT-value, threshold value, average slice CT-value, average segment CT-valuefine aggregate and filler and CT image of bitumen was nearly homogeneous.In the mixture examination, histograms of CT-value and four segmentation images made from CT images expressedaverage CT-value of the bitumen.

Keywords： asphalt concrete mixture     aggregate     bitumen     bitumen content     quality evaluation     X-ray CT    

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A miniature triaxial apparatus for investigating the micromechanics of granular soils with

Zhuang CHENG, Jianfeng WANG, Matthew Richard COOP, Guanlin YE

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 357-373 doi: 10.1007/s11709-019-0599-2

Abstract: In conjunction with an X-ray micro-tomography (termed as X-ray μCT hereafter) facility and advanced imageThe developed triaxial apparatus, in its combined use of X-ray μCT imaging techniques, is a powerful

Keywords： triaxial apparatus     X-ray μCT     in situ test     micro-scale mechanical behavior     granular soils    

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analysis of soil failure on defective underground pipe due to cyclic water supply and drainage using X-ray CT

Toshifumi MUKUNOKI, Naoko KUMANO, Jun OTANI

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2,   Pages 85-100 doi: 10.1007/s11709-012-0159-5

Abstract: mechanism of cavity generation in the model ground was observed using an X-ray Computed Tomography (CT

Keywords： relative density     grain property     model test     road subsidence     underground pipe     image processing     X-ray CT    

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Title Author Date Type Operation

Simultaneous acquisition of CT angiography and whole brain CT perfusion images by using multiphase dynamichelical scan on 16 MDCT

Weiwei CHEN, Jianpin QI, Wenzhen ZHU, Wenhua HUANG, Jinmei SONG

Journal Article

A pilot study on Paxlovid therapy for hemodialysis patients with severe acute respiratory syndrome coronavirus 2 infections

Journal Article

Trauma-induced “Macklin effect” with pneumothorax and large pneumomediastinum, disguised by allergy

Salomone Di Saverio, Kenji Kawamukai, Andrea Biscardi, Silvia Villani, Luca Zucchini, Gregorio Tugnoli

Journal Article

Efficient scheme of low-dose CT reconstruction using TV minimization with an adaptive stopping strategy

Yong DING, Tuo HU

Journal Article

Low-dose CT for lung cancer screening: opportunities and challenges

Hongbing Shen

Journal Article

A Motion-Adaptive Algorithm for Video Scan Format Conversion and the Hardware Implementation

Zhang Guanglie,Zheng Nanning,Wu Yong,Zhang Xia

Journal Article

The dynamic correction of collimation errors of CT slicing pictures

LIU Ya-xiong, Sekou Sing-are, LI Di-chen, LU Bing-heng

Journal Article

A New Adaptive Frame Rate Upconversion Algorithm for Scan Rate Conversion and Its FPGA Implementation

Wu Yong,Zhang Guanglie,Zheng Nanning,Zhang Xia

Journal Article

A Video Scan Format Conversation Algorithm Based onSpatio-temporal Weight and Edge Direction

Ding Yong,Lu Shengli,Shi Longxing

Journal Article

Analyzing the characterization of pore structures and permeability of diesel contaminated clays under different aging conditions

Journal Article

Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Journal Article

Comparison of CT-guided aspiration to key hole craniotomy in the surgical treatment of spontaneous putaminal

ZHAO Jizong, WANG Dejiang, WANG Shuo, YUAN Ge, KANG Shuai, JI Nan, ZHAO Yuanli, YE Xun, ZHOU Liangfu, ZHOU Dingbiao, WANG Renzhi, WANG Mei

Journal Article

A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Journal Article

A miniature triaxial apparatus for investigating the micromechanics of granular soils with

Zhuang CHENG, Jianfeng WANG, Matthew Richard COOP, Guanlin YE

Journal Article

analysis of soil failure on defective underground pipe due to cyclic water supply and drainage using X-ray CT

Toshifumi MUKUNOKI, Naoko KUMANO, Jun OTANI

Journal Article