Comprehensive quantitative evaluations of reconstruction method using oil-gel-based phantom in ultrasound computed tomography

2020 ◽  
Author(s):  
Atsuro Suzuki ◽  
Yushi Tsubota ◽  
Wenjing Wu ◽  
Kazuhiro Yamanaka ◽  
Takahide Terada ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Reconstruction Method ◽  
Ultrasound Computed Tomography ◽  
Quantitative Evaluations

scholarly journals Breast Acoustic Parameter Reconstruction Method Based on Capacitive Micromachined Ultrasonic Transducer Array

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 963
Author(s):  
Yu Pei ◽  
Guojun Zhang ◽  
Yu Zhang ◽  
Wendong Zhang
Keyword(s):  
Computed Tomography ◽  
Time Reversal ◽  
Sound Speed ◽  
Ultrasonic Transducer ◽  
Reconstruction Method ◽  
Propagation Theory ◽  
Speed Distribution ◽  
Ultrasound Computed Tomography ◽  
Wide Range ◽  
Capacitive Micromachined Ultrasonic Transducer

Ultrasound computed tomography (USCT) systems based on capacitive micromachined ultrasonic transducer (CMUT) arrays have a wide range of application prospects. For this paper, a high-precision image reconstruction method based on the propagation path of ultrasound in breast tissue are designed for the CMUT ring array; that is, time-reversal algorithms and FBP algorithms are respectively used to reconstruct sound speed distribution and acoustic attenuation distribution. The feasibility of this reconstruction method is verified by numerical simulation and breast model experiments. According to reconstruction results, sound speed distribution reconstruction deviation can be reduced by 53.15% through a time-reversal algorithm based on wave propagation theory. The attenuation coefficient distribution reconstruction deviation can be reduced by 61.53% through FBP based on ray propagation theory. The research results in this paper will provide key technological support for a new generation of ultrasound computed tomography systems.

Comparison of Four Forward Models for Breast Imaging in Ultrasound Computed Tomography

2019 ◽  
Vol 28 (4) ◽  
pp. 805-816 ◽  
Author(s):  
Ruijing Li ◽  
Houjin Chen ◽  
Yahui Peng ◽  
Jupeng Li
Keyword(s):  
Computed Tomography ◽  
Breast Imaging ◽  
Forward Models ◽  
Ultrasound Computed Tomography

Dynamics of the right atrio-ventricular junction in human: a spatial high-resolution study with multiphase computed tomography

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
J Jouan ◽  
I Masari ◽  
V Bliah ◽  
G Soulat ◽  
D Craiem ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cardiac Cycle ◽  
Cardiac Computed Tomography ◽  
Reconstruction Method ◽  
Imaging Data ◽  
High Definition ◽  
Vertical Projection ◽  
Horizontal Projection ◽  
Cross Sectional ◽  
The Right

Abstract Introduction In order to improve knowledge of the tricuspid valve (TV) function and its coupling with the right atrio-ventricular junction (RAVJ) and right ventricle (RV), new four-dimensional high-definition imagery methods are mandatory (3D+t). Purpose Using an innovative reconstruction method based on multiphase cardiac computed tomography imaging (4D-MCCTI), we finely analyzed the morphological & dynamical features of tricuspid annulus (TA) and RAVJ components in order to assess new functional parameters of TV and RV functions. Methods Volume imaging data sets through time were obtained from 4D-MCCTI of 30 subjects (sex ratio 1, mean age 57±11y.) with no rhythm, valvular or ventricular abnormalities on echocardiography and implemented in a custom software for 3D semi-automated delineation of 18 points around TA perimeter. Coordinates of these points in each of the 10 time-phases within an RR interval were used to calculate specific geometrical features of TA such as 3D/2D areas, perimeters, 360°-diameters and vertical deformation. Subsequently, RV and Right Atrium (RA) inner contours were also delineated (Figure). Results TA shape was elliptical in horizontal projection with a mean eccentricity index (EcI) of 0.58±0.12; and saddle-shapped in vertical projection with a horn nearby the antero-septal commissure. This feature remained throughout the cardiac cycle but TA was more planar (minimal TA-height: 4.47±1.04 mm) and circular (minimal EcI=0.44±0.14) in mid-diastole when TA-3Darea and TA-3Dperimeter reached a maximum of 6.98±1.21 cm2/m2 and 7.41±0.91 cm, respectively. Correlation between TA-3Darea, TA-2Darea and latero-septal diameter (LSD) were R2=0.99 and R2=0.73, respectively. LSD was minimal in early-systole (18.83±3.04 mm/m2) and maximal in mid-diastole (20.04±3.05 mm/m2). Correlation of TA-3Darea with RV and RA cross-sectional areas were R2=0.82 and R2=0.71, respectively. Conversely, there was no significant correlation between TA, RV and RA concentric contractions. Conclusions Our method for 4D-MTCCI analysis has allowed confirming the shape and dynamics function of RAVJ throughout the cardiac cycle in healthy subjects, and giving new reference parameters for TV and RV evaluation. Software multiplanar view of TA Funding Acknowledgement Type of funding source: None

scholarly journals Vasitis: clinical and ultrasound confusion with inguinal hernia clarified by computed tomography

2013 ◽  
Vol 5 (4) ◽  
pp. 74
Author(s):  
Kathleen Eddy ◽  
Bruce Piercy ◽  
Richard Eddy
Keyword(s):  
Computed Tomography ◽  
Inguinal Hernia ◽  
Spermatic Cord ◽  
Vas Deferens ◽  
The Other ◽  
Other Hand ◽  
Ultrasound Computed Tomography ◽  
Ultrasound Findings ◽  
Duplex Doppler

Vasitis or inflammation of the vas deferens is a rarely describedcondition categorized by Chan & Schlegel1 as either generallyasymptomatic vasitis nodosa or the acutely painful infectious vasitis.Clinically, infectious vasitis presents with nonspecific symptomsof localized pain and swelling that can be confused with other,more common conditions such as epididymitis, orchitis, testiculartorsion, and inguinal hernia. Ultrasound with duplex Doppler scanningcan be used to exclude epididymitis, orchitis, and testiculartorsion. On the other hand, while inguinal hernia is difficult todifferentiate from vasitis using ultrasound, computed tomography(CT) is diagnostic. We describe 2 cases of vasitis with clinicaland ultrasound findings that initially were interpreted as inguinalhernias. In both patients, CT was diagnostic for vasitis showing anedematous spermatic cord and no hernia. Urine cultures in bothpatients were negative, but the symptoms resolved with antibiotictreatment.

scholarly journals Dictionary learning sparse-sampling reconstruction method for in-vivo 3D photoacoustic computed tomography

2019 ◽  
Vol 10 (4) ◽  
pp. 1660 ◽  
Author(s):  
Fangyan Liu ◽  
Xiaojing Gong ◽  
Lihong V. Wang ◽  
Jingjing Guan ◽  
Liang Song ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dictionary Learning ◽  
Sparse Sampling ◽  
Reconstruction Method

scholarly journals Mucinous Neoplasm of the Appendix as a Mimic of Cystic Adnexal Pathology

2018 ◽  
Vol 8 ◽  
pp. 32 ◽  
Author(s):  
Chris Hutchinson ◽  
Jonathan Lyske ◽  
Vimal Patel ◽  
Gavin Low
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Mucinous Tumor ◽  
Imaging Findings ◽  
Resonance Imaging ◽  
Mucinous Neoplasm ◽  
Ultrasound Computed Tomography ◽  
Adnexal Pathology

Pelvic pain presents a common diagnostic conundrum with a myriad of causes ranging from benign and trivial to malignant and emergent. We present a case where a mucinous neoplasm of the appendix acted as a mimic for tubular adnexal pathology on imaging. With the associated imaging findings on ultrasound, computed tomography, and magnetic resonance imaging, we wish to raise awareness of mucinous tumors of the appendix when tubular right adnexal pathology is present both in the presence of pelvic or abdominal pain or when noted incidentally. Tubular pathology such as uncomplicated paraovarian cysts or hydrosalpinx is frequently treated conservatively with long-interval follow-up imaging or left to clinical follow-up. Thus, if incorrectly diagnosed as tubular pathology, an appendix mucocele or mucinous neoplasm of the appendix is likely to be undertreated. We wish to clarify some of the confusion around nomenclature and classification of the multiple entities that are comprised by the terms mucocele and mucinous tumor of the appendix.

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