Coherence Factor-Like Beamforming for Ultrasound Computed Tomography

2020 ◽  
Vol 10 (3) ◽  
pp. 672-676
Author(s):  
Shanshan Wang ◽  
Liang Zeng ◽  
Junjie Song ◽  
Liang Zhou ◽  
Mingyue Ding ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Center Frequency ◽  
Medical Ultrasound ◽  
Practical Application ◽  
Image Brightness ◽  
Coherence Factor ◽  
Ultrasound Computed Tomography ◽  
Breast Phantom ◽  
Black Region ◽  
Type Transducer

Ultrasound computed tomography (USCT) has important clinical application prospect in breast cancer screening and early diagnosis. In this paper, six kinds of coherence factor-like beamforming methods have been applied to improve the image quality for USCT, including coherence factor (CF), phase coherence factor (PCF), sign coherence factor (SCF), phasor dispersion based coherence factor (PDCF), spatial smoothed coherence factor (SSCF) and spatio-temporally smoothed coherence factor (STSCF). The mentioned methods were verified with the radio-frequency (RF) data of the breast phantom captured by the USCT system developed in the Medical Ultrasound Laboratory. The ring-type transducer has 1024 elements with a center frequency of 2.5 MHz. Experimental results show that the reconstructed images of the breast phantom by the CF gets the highest contrast to noise ratio (CNR), but overall image brightness reduces significantly. PCF gets the lowest variance and provides a more homogenous background. STSCF beamforming method can improve the robustness of the PCF and having the ability to suppress clutter while significant removal of black region artifacts. For practical application, these coherence factor-like beamforming methods can be implemented with low computational complexity.

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

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.

A feasibility study of time of flight cone beam computed tomography imaging

2021 ◽  
pp. 1-14
Author(s):  
Ignacio O. Romero ◽  
Changqing Li
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Time Of Flight ◽  
Cone Beam ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Effects ◽  
Breast Phantom ◽  
Scatter Reduction ◽  
Strong Scattering

BACKGROUND: The time of flight (TOF) cone beam computed tomography (CBCT) was recently shown to reduce the X-ray scattering effects by 95%and improve the image CNR by 110%for large volume objects. The advancements in X-ray sources like in compact Free Electron Lasers (FEL) and advancements in detector technology show potential for the TOF method to be feasible in CBCT when imaging large objects. OBJECTIVE: To investigate feasibility and efficacy of TOF CBCT in imaging smaller objects with different targets such as bones and tumors embedded inside the background. METHODS: The TOF method used in this work was verified using a 24cm phantom. Then, the GATE software was used to simulate the CBCT imaging of an 8 cm diameter cylindrical water phantom with two bone targets using a modeled 20 keV quasi-energetic FEL source and various TOF resolutions ranging from 1 to 1000 ps. An inhomogeneous breast phantom of similar size with tumor targets was also imaged using the same system setup. RESULTS: The same results were obtained in the 24cm phantom, which validated the applied CBCT simulation approach. For the case of 8cm cylindrical phantom and bone target, a TOF resolution of 10 ps improved the image contrast-to-noise ratio (CNR) by 57%and reduced the scatter-to-primary ratio (SPR) by 8.63. For the case of breast phantom and tumor target, image CNR was enhanced by 12%and SPR was reduced by 1.35 at 5 ps temporal resolution. CONCLUSIONS: This study indicates that a TOF resolution below 10 ps is required to observe notable enhancements in the image quality and scatter reduction for small objects around 8cm in diameter. The strong scattering targets such as bone can result in substantial improvements by using TOF CBCT.

scholarly journals Development of a digital breast phantom for photoacoustic computed tomography

2021 ◽  
Vol 12 (3) ◽  
pp. 1391
Author(s):  
Youwei Bao ◽  
Handi Deng ◽  
Xuanhao Wang ◽  
Hongzhi Zuo ◽  
Cheng Ma
Keyword(s):  
Computed Tomography ◽  
Breast Phantom

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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