Xeromammography in screening for breast cancer

Frankl, Gloria

doi:10.1080/00325481.1980.11715470

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Although the presented work is focused on comparisons of two recent scatter correction methods, our finding reveals an important fact that OFR, an error source considered as secondary in x‐ray imaging, results in substantial difference of imaging performance in CBBCT. A critical requirement for a breast cancer diagnostic device is the ability to accurately detect micro‐calcification as they are frequently associated with malignancy . To date, many efforts have been exerted to optimize the detector performance of CBBCT system for better detection of micro‐calcifications, but there have not been any studies to investigate the dependency of OFR.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…A critical requirement for a breast cancer diagnostic device is the ability to accurately detect micro-calcification as they are frequently associated with malignancy. 39,40 To date, many efforts have been exerted to optimize the detector performance of CBBCT system for better detection of micro-calcifications, 41,42 but there have not been any studies to investigate the dependency of OFR. The results presented in this study show that the OFR has a significant impact on the image quality in terms of spatial resolution and contrast, and this effect is especially prominent for fine structures (i.e., micro-calcifications) in CBBCT images.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

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The role of off‐focus radiation in scatter correction for dedicated cone beam breast CT

et al. 2017

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Purpose: Dedicated cone beam breast CT (CBBCT) suffers from x-ray scatter contamination. We aim to identify the source of the significant difference between the scatter distributions estimated by two recent methods proposed by our group and to investigate its effect on CBBCT image quality. Method: We recently proposed two novel methods of scatter correction for CBBCT, using a library based (LB) technique and a forward projection (FP) model. Despite similar enhancement on CBBCT image qualities, these two methods obtain very different scatter distributions. We hypothesize that the off-focus radiation (OFR) is the contributor and results in nontrivial signals in x-ray projections, which is ignored in the scatter estimation via the LB method. Experiments using a thin wire test tool are designed to study the effect of OFR on CBBCT spatial resolution by measuring the point spread function (PSF) and the modulation transfer function (MTF). A narrow collimator setting is used to suppress the OFR-induced signals. In addition, "PSFs" and "MTFs" are measured on clinical CBBCT images obtained by the LB and FP methods using small calcifications as point sources. The improvement of spatial resolution achieved by suppressing OFR in the wire experiment as well as in the clinical study is quantified by the improvement ratios of PSFs and spatial frequencies at different MTF values. Our hypothesis that OFR causes the imaging difference between the FP and LB methods is verified if these ratios obtained from experimental and clinical data are consistent. Results: In the wire experiment, the results show that suppression of OFR increases the maximum signal of the PSF by about 14% and reduces the full-width-at-half-maximum (FWHM) by about 12.0%. Similar improvement on spatial resolution is achieved by the FP method compared with the LB method in the patient study. The improvement ratios of spatial frequencies at different MTF values without OFR match very well in both studies at a level of around 16%, with an average rootmean-square difference of 0.47%. Conclusion:The results of the wire experiment and the clinical study indicate that the main difference between the LB and FP methods is whether the OFR-induced signals are included after scatter correction. Our study further shows that OFR significantly affects the image spatial resolution of CBBCT, indicating that the visualization of micro-calcifications is susceptible to OFR contamination. Our finding is therefore important in further improvement of diagnostic performance of CBBCT.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

The role of off‐focus radiation in scatter correction for dedicated cone beam breast CT

et al. 2017

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“…T he conventional mammogram is used extensively and successfully to detect nonpalpable masses in women of all ages. 1 The ultrasound mammogram has been shown to be primarily a complementary study to the X-ray mammogram and the physical examination. 2 -4 In others with a normal mammogram, a subtle abnormal area on physical examination or a nonpalpable mass may be clearly delineated on ultrasound.…”

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confidence: 99%

Ultrasound for guidance of breast mass removal.

Rifkin

Schwartz²,

Pasto

et al. 1988

Journal of Ultrasound in Medicine

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Hand·held sonomammography was used intraoperatively to localize 52 masses in 45 women in an out pa· tient operating suite. All but five women had a positive X-ray mammogram. The ultrasound mammogram was able to identify all lesions. In 42 women studied by a preoperative ultrasound examination before the operating room procedure, all the masses were successfully identified. Precise localization was successfully performed in the operating room before sterile preparation in less than 10 minutes. Relocalization after incision in the sterile operating field was necessary in two cases.T he conventional mammogram is used extensively and successfully to detect nonpalpable masses in women of all ages.1 The ultrasound mammogram has been shown to be primarily a complementary study to the X-ray mammogram and the physical examination. 2 -4 In others with a normal mammogram, a subtle abnormal area on physical examination or a nonpalpable mass may be clearly delineated on ultrasound.The use of the X·ray mammogram to place a flexible wire or needle near or adjacent to the lesion has been used to aid in surgical guidance for excisional biopsy. This technique requires no ionizing radiation and expedites outpatient surgical removal of the lesion. Of the 52 masses, there were 32 fibroadenomas, three carcinomas, three cysts, six cases of focal fibrous mastitis, and eight patients with focal fibrocystic disease. In patients with positive sonograms for nonpalpable masses, ultrasound localization is a fast, accurate alternative to X -ray needle placement. KEY WORDS: breast biopsy, breast ultrasound, breast cancer: diagnosis, sonomammography. (/Ultrasound Med 7:261, 1988) able, time-consuming (particularly if needle placement is inaccurate on the first attempt), and requires ionizing radiation.We used high resolution hand-held sonomammogra• phy in the operating suite to allow rapid and accurate localization and excision for a variety of breast lesions. Our experience is the basis of this report. METHODS AND MATERIALSForty-five women, 19 to 64 years of age, were included in this study. All subjects who had intraoperative ultrasound guidance are included. However, not all women undergoing excisional biopsy for a mass had preoperative ultrasound. This latter group is not included in this report. Forty subjects had preoperative X-ray mammograms. Forty•two had preoperative ultrasound studies. In this latter group, all masses were identified.The intraoperative ultrasound was performed with the patient lying supine, positioned for surgery, with the

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“…Every symptomatic breast patient over 30 years of age, any woman with a dominant palpable mass, and every woman scheduled for breast biopsy require mammography [2] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Breast Masses in Hilly Areas, an Initial Experience

Sharma¹

2018

jmscr

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Xeromammography in screening for breast cancer

Cited by 4 publications

References 5 publications

The role of off‐focus radiation in scatter correction for dedicated cone beam breast CT

The role of off‐focus radiation in scatter correction for dedicated cone beam breast CT

Ultrasound for guidance of breast mass removal.

Evaluation of Breast Masses in Hilly Areas, an Initial Experience

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