Contrast improvement of backscatter x-ray images by total variation method
نویسندگان
چکیده
اساس سیستم‌های تصویربرداری ایکس پسپراکنده، پرتوهای بازگشتی هستند که در صنعت و بازرسی دارای کاربرد‌های بسیاری می‌باشند. این تصاویر برخلاف روش عبوری، مواد آلی با عدد اتمی پایین مانند مخدر منفجره پراکندگی فوتون بالا، واضح‌تر دیده می‌شوند. به علت چندگانه فوتونی معمولاً ماتشدگی دارند. پردازش خروجی می‌تواند بهبود کنتراست تشخیص کمک کند. تحقیق از وردش برای استفاده شده پرتونگاره‌های فانتوم‌هایی ارزیابی کیفیت سیستم کارایی دارند، مورد قرار گرفته‌اند. نتایج نشان می‌دهند نسبی افزایش قدرت تمایز اجسام کارا بوده عنوان یک فیلتر کمکی مؤثر باشد. توسط کارشناسان پرتونگاری می‌دهد نظر آنها حدود 20% تا 40% یافته طور قابل ملاحظه‌ای ارتقا پیدا کرده‌اند.
منابع مشابه
X-ray Backscatter Imaging For
3 For my daughter, Alyssa, and her future 4 ACKNOWLEDGMENTS I would like to thank God, for the gifts he has given me that allow me to walk this path and complete this journey. I am truly thankful for all the gifts He has given me. I need to thank my family, Missy and my daughter, Alyssa, for their patience, support and sacrifices they have made. I also need to thank my most active advisors Dr. ...
متن کاملPhase retrieval in in-line x-ray phase contrast imaging based on total variation minimization.
State-of-the-art techniques for phase retrieval in propagation based X-ray phase-contrast imaging are aiming to solve an underdetermined linear system of equations. They commonly employ Tikhonov regularization - an L2-norm regularized deconvolution scheme - despite some of its limitations. We present a novel approach to phase retrieval based on Total Variation (TV) minimization. We incorporated...
متن کاملTotal variation minimization approach in in-line x-ray phase-contrast tomography.
The reconstruction problem in in-line X-ray Phase-Contrast Tomography is usually approached by solving two independent linearized sub-problems: phase retrieval and tomographic reconstruction. Both problems are often ill-posed and require the use of regularization techniques that lead to artifacts in the reconstructed image. We present a novel reconstruction approach that solves two coupled line...
متن کاملContrast variation in X-ray and neutron scattering
‘Suppose a region [= volume] v of constant shape to be occupied by the molecule which for the present purposes is defined as the region into which salt does not penetrate when a salt solution is substituted for water. It is assumed that the density of the liquid outside v is uniform. The effect on the value of F [= structure factor] of increasing density everywhere outside v is equivalent to th...
متن کاملNoninterferometric phase-contrast images obtained with incoherent x-ray sources.
We report on what are believed to be the first full-scale images obtained with the coded aperture concept, which uses conventional x-ray sources without the need to collimate/aperture their output. We discuss the differences in the underpinning physical principles with respect to other methods, and explain why these might lead to a more efficient use of the source. In particular, we discuss how...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: ???? ???? ? ???? ??????
سال: 2023
ISSN: ['1735-1871', '2676-5861']
DOI: https://doi.org/10.24200/nst.2023.1322