Optimization of tube potential–filter combinations for film-screen mammography

Chida, Koichi; Zuguchi, Masayuki; Sai, Masahiro; Saito, Haruo; Yamada, Takayuki; Ishibashi, Tadashi; Ito, Daisuke; Kimoto, Nobumitsu; Kohzuki, Masahiro; Takahashi, Satoshi

doi:10.1016/j.clinimag.2004.11.003

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…The phantom is essential for image quality or radiation dose measurement, and phantoms of various shapes and sizes are being used worldwide [20][21][22][23][24][25][26][27][28][29]. Direct physical dose measurement in a relatively homogeneous medium such as this phantom enables radiation dose N17 measurement in every modality quickly and easily.…”

Section: Discussionmentioning

confidence: 99%

Novel pregnant model phantoms for measurement of foetal radiation dose in x-ray examinations

et al. 2021

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This study presents a comparison of novel pregnant model phantoms with a handmade phantom in terms of shape and radiation measurement points to determine which model is more suitable for measuring the foetal radiation dose during x-ray examinations. Novel pregnant model phantoms were constructed using an anthropomorphic phantom in combination with two differently-sized custom-made abdomen phantoms simulating pregnancy, which were constructed from a polyurethane resin. The size and shape of the polyurethane resin were designed based on abdominal sizes and shapes collected from the computed tomography examinations at 18 pregnant patients of one hospital. The handmade pregnant model phantom was constructed using an anthropomorphic phantom and a beach ball containing water. Compared with the handmade phantom, there were additional dose measurement points on the novel pregnant model phantoms. Our model phantoms improved upon the handmade phantom in terms of shape and radiation measurement points. We produced pregnant model phantoms that simulated the shapes and sizes of actual patients for the first time.

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Section: Discussionmentioning

confidence: 99%

Novel pregnant model phantoms for measurement of foetal radiation dose in x-ray examinations

et al. 2021

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“…Chida et al () studied the CD phantoms applied to the film‐screen mammography. The phantom images must be made in the best field‐of‐vision conditions and with a low‐level of background light.…”

Section: Introductionmentioning

confidence: 99%

An Automatic Evaluation System for Contrast‐Detail Phantom Images in Digital Radiography

Lin

Cheng

et al. 2012

Int J Imaging Syst Tech

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Currently, contrast-detail phantom (CD phantom) images are widely used to assist medical experts for diagnosis, because these images can be used to study imaging quality and assess the radiation dose amount for digital X-ray imaging systems. However, the quality of the CD phantom image varies from person to person, increasing the possibility of false diagnosis. In this article, we propose an automatic evaluation system to measure the quality of a phantom image an alternative to assessment by radiologists. The proposed method is based on bilinear pixel interpolation, geometric transformation, and region shifting to efficiently and objectively evaluate the quality of a phantom image. Moreover, misjudgment modification is also proposed to further improve the recognition accuracy. The experimental results show that the accuracy of the proposed method is very close to that of the radiologists' observations. The results have also proven that the proposed method is a feasible way to evaluate the quality of a phantom image in an objective and automatic manner. V

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“…Furthermore, it is also necessary to image objects of small size, such as microcalcifications, or of low contrast, such as masses. Studies, concerning the improvement of image quality characteristics in mammography with the proper selection of x-ray imaging parameters, have been implemented on the basis of both clinical or experimental results [2][3][4][5] and Monte Carlo simulation studies [6][7][8]. Through these studies it has become apparent that a major factor affecting the image quality is the mammographic x-ray spectrum.…”

Section: Introductionmentioning

confidence: 99%

Investigating the dependence of breast calcifications signal to noise ratio on mammographic spectra: Monte Carlo simulation studies

Delis¹,

Vlachopoulou²,

Spyrou³

et al. 2009

J. Inst.

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A Monte Carlo simulation model is utilized to study the influence of mammographic spectra on the SNR of simulated inhomogeneities representing calcifications of various thicknesses, embedded inside a mathematical breast phantom. The phantom is semicylindrical, mimicking a physical phantom for mammography, with background simulating glandular breast tissue. A step wedge arrangement with foils composed of Hydroxyapatite, was embedded. Monte Carlo methods have been used to sample the initial x-ray photon energy and trace the photons inside the breast, taking into account all possible physical processes. For the purposes of this study, only the third dimension (thickness) of calcifications was kept in realistic size, since it is the one related with the influence of the x-ray spectrum on the image, while the calcifications visibility with respect to their projection size is mainly affected by the resolving power of the imaging system. The discrimination of different calcifications thicknesses, described in terms of SNR, strongly depends on all the parameters affecting the x-ray spectrum. Tube voltage strongly affects SNR of small and medium thickness calcifications. The common Mo/Mo spectrum demonstrates improved characteristics, with SNR differences up to 14%, with respect to Rh/Rh for the entire thickness range of calcifications studied. Increase in filter thickness decreases SNR for calcification thicknesses less than 1200 µm, while beyond this point increased filter thickness results in improved SNR. As far as the filter material is concerned, the thicker calcification to be visualized, the higher the k-absorption edge of the filter required, in order to achieve the maximum SNR.

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Optimization of tube potential–filter combinations for film-screen mammography

Cited by 4 publications

References 12 publications

Novel pregnant model phantoms for measurement of foetal radiation dose in x-ray examinations

Novel pregnant model phantoms for measurement of foetal radiation dose in x-ray examinations

An Automatic Evaluation System for Contrast‐Detail Phantom Images in Digital Radiography

Investigating the dependence of breast calcifications signal to noise ratio on mammographic spectra: Monte Carlo simulation studies

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