Weakly Inhomogeneous Media Tomography

Our objective is to develop an ultrasonic scanner for breast imaging. High resolution is obtained by using wide-band spherical waves transmitted and measured in the near field zone (i.e., close to the skin) all around the organ. The tomographic approach that we adopt allows us to use low central frequency waves (3–7 MHz) that are suitable for good penetration while maintaining high resolution and contrast. The procedure is thus suitable for early detection of tumors and increases the chances of total recovery. The novelty of the present reconstruction procedure is that it associates the signals acquired in transmission to the data measured in reflection over a large aperture. This enables us to correct the phase aberration induced by weak inhomogeneities whose sizes might be several wavelengths. Numerical tests based on Finite Difference Time Domain (FDTD) simulations demonstrate the greater fidelity of the reconstruction.

Download Full-text

HIGH RESOLUTION RADAR FOCUSING USING SPECTRAL ESTIMATION METHODS IN WIDE-BAND AND NEAR-FIELD CONFIGURATIONS: APPLICATION TO MILLIMETER-WAVE NEAR-RANGE IMAGING

Progress In Electromagnetics Research B ◽

10.2528/pierb17082402 ◽

2017 ◽

Vol 79 ◽

pp. 45-64

Author(s):

Antoine Jouade ◽

Laurent Ferro-Famil ◽

Stephane Meric ◽

Olivier Lafond ◽

Laurent Le Coq

Keyword(s):

High Resolution ◽

Millimeter Wave ◽

Near Field ◽

Spectral Estimation ◽

Wide Band ◽

Estimation Methods ◽

Range Imaging ◽

High Resolution Radar

Download Full-text

Use of multi‐angle ultra‐wide band microwave sounding for high resolution breast imaging

Medical Physics ◽

10.1002/mp.14408 ◽

2020 ◽

Vol 47 (10) ◽

pp. 5147-5157

Author(s):

Sergey Shipilov ◽

Aleksandr Eremeev ◽

Vladimir Yakubov ◽

Ivan Fedyanin ◽

Rail Satarov ◽

...

Keyword(s):

High Resolution ◽

Breast Imaging ◽

Wide Band ◽

Ultra Wide Band ◽

Microwave Sounding

Download Full-text

Determining of Refractive Index Profile of Optical Fibers from Measured Intensity in Near-Field Zone

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v60.i789.120 ◽

2003 ◽

Vol 60 (7-9) ◽

pp. 86-91

Author(s):

A.I. Filipenko

Keyword(s):

Refractive Index ◽

Optical Fibers ◽

Near Field ◽

Refractive Index Profile ◽

Index Profile ◽

Field Zone ◽

Measured Intensity

Download Full-text

High-resolution deep-UV laser mask repair based on near-field optical technology

10.1117/12.245238 ◽

1996 ◽

Cited By ~ 2

Author(s):

Klony S. Lieberman ◽

Hanan Terkel ◽

Michael Rudman ◽

A. Ignatov ◽

Aaron Lewis

Keyword(s):

High Resolution ◽

Near Field ◽

Uv Laser ◽

Optical Technology ◽

Deep Uv

Download Full-text

Design of high-resolution near-field focusing metasurface lens

Journal of Electromagnetic Waves and Applications ◽

10.1080/09205071.2021.1934569 ◽

2021 ◽

pp. 1-10

Author(s):

Jiang Li ◽

Zhu Wang ◽

Yue Ma ◽

Xuehong Ran ◽

Honggang Hao

Keyword(s):

High Resolution ◽

Near Field

Download Full-text

Clinical practice guidelines for high-resolution breast PET, 2019 edition

Annals of Nuclear Medicine ◽

10.1007/s12149-021-01582-y ◽

2021 ◽

Vol 35 (3) ◽

pp. 406-414

Author(s):

Yoko Satoh ◽

Masami Kawamoto ◽

Kazunori Kubota ◽

Koji Murakami ◽

Makoto Hosono ◽

...

Keyword(s):

High Resolution ◽

Practice Guidelines ◽

Breast Imaging ◽

Japanese Society ◽

Insurance Coverage ◽

Whole Body ◽

Positron Emission Mammography ◽

Dedicated Breast Pet ◽

Positron Emission ◽

Different Types

AbstractBreast positron emission tomography (PET) has had insurance coverage when performed with conventional whole-body PET in Japan since 2013. Together with whole-body PET, accurate examination of breast cancer and diagnosis of metastatic disease are possible, and are expected to contribute significantly to its treatment planning. To facilitate a safer, smoother, and more appropriate examination, the Japanese Society of Nuclear Medicine published the first edition of practice guidelines for high-resolution breast PET in 2013. Subsequently, new types of breast PET have been developed and their clinical usefulness clarified. Therefore, the guidelines for breast PET were revised in 2019. This article updates readers as to what is new in the second edition. This edition supports two different types of breast PET depending on the placement of the detector: the opposite-type (positron emission mammography; PEM) and the ring-shaped type (dedicated breast PET; dbPET), providing an overview of these scanners and appropriate imaging methods, their clinical applications, and future prospects. The name “dedicated breast PET” from the first edition is widely used to refer to ring-shaped type breast PET. In this edition, “breast PET” has been defined as a term that refers to both opposite- and ring-shaped devices. Up-to-date breast PET practice guidelines would help provide useful information for evidence-based breast imaging.

Download Full-text

Wide-Band Input Buffer with Optimized Linearity For High-Speed High-Resolution ADCs

2020 IEEE 14th International Conference on Anti-counterfeiting, Security, and Identification (ASID) ◽

10.1109/asid50160.2020.9271786 ◽

2020 ◽

Author(s):

Ting Li ◽

Yong Zhang ◽

Yabo Ni ◽

Xingfa Huang

Keyword(s):

High Resolution ◽

High Speed ◽

Wide Band ◽

Input Buffer

Download Full-text

ENHANCEMENT OF SCREEN FILM MAMMOGRAM UP TO A LEVEL OF DIGITAL MAMMOGRAM: EXPERIMENTAL ANALYSIS

International Journal of Image and Graphics ◽

10.1142/s0219467813400044 ◽

2013 ◽

Vol 13 (02) ◽

pp. 1340004

Author(s):

APARNA NARENDRA BHALE ◽

MANISH RATNAKAR JOSHI

Keyword(s):

Experimental Analysis ◽

Breast Imaging ◽

Point Of View ◽

Quality Analysis ◽

Digital Mammogram ◽

Total Recovery ◽

Clinical Observations ◽

Opinion Score ◽

Better Than

Breast cancer is one of the major causes of death among women. If a cancer can be detected early, the options of treatment and the chances of total recovery will increase. From a woman's point of view, the procedure practiced (compression of breasts to record an image) to obtain a digital mammogram (DM) is exactly the same that is used to obtain a screen film mammogram (SFM). The quality of DM is undoubtedly better than SFM. However, obtaining DM is costlier and very few institutions can afford DM machines. According to the National Cancer Institute 92% of breast imaging centers in India do not have digital mammography machines and they depend on the conventional SFM. Hence in this context, one should answer "Can SFM be enhanced up to a level of DM?" In this paper, we discuss our experimental analysis in this regard. We applied elementary image enhancement techniques to obtain enhanced SFM. We performed the quality analysis of DM and enhanced SFM using standard metrics like PSNR and RMSE on more than 350 mammograms. We also used mean opinion score (MOS) analysis to evaluate enhanced SFMs. The results showed that the clarity of processed SFM is as good as DM. Furthermore, we analyzed the extent of radiation exposed during SFM and DM. We presented our literally findings and clinical observations.

Download Full-text