Doku eşdeğeri materyaller için moleküler form faktör verileri

Yıl 2024, Cilt: 26 Sayı: 2, 549 - 555, 15.07.2024

Aysun Böke

https://doi.org/10.25092/baunfbed.1430595

Öz

Tanısal x-ışını enerji aralığında, elastik (koherent) saçılma baskın olup uygun form faktörü kullanılarak elde edilebilmektedir. Deneysel Form Faktör verilerinin mevcut olmadığı belirli momentum transfer değerlerinde, deneysel verilerle uyumlu olabilecek şekilde moleküler form faktör verileri teorik olarak elde edilmelidir. Bu moleküler form faktör verileri kullanılarak moleküler koherent saçılma katsayıları hesaplanabilmekte ve doku eşdeğeri yapıların lineer zayıflama katsayıları tahmin edilebilmektedir. Bu çalışmada, insan meme dokusuna eşdeğer kompleks moleküler yapılar olan PMMA, CIRS 70/30, CIRS 50/50, CIRS 30/70, RMI 454 ve BR 12 incelenmiş ve her birine ait, deneysel form faktörleri ile uyumlu olan moleküler form faktör F(x) değerleri teorik olarak elde edilmiştir. Sonuçlarımızın daha ileriki çalışmalarımızda ve ayrıca modellemeler yapan diğer araştırmacıların çalışmalarında kullanılması suretiyle literatürde geniş yer bulacağına ve yarar sağlayacağına inancımız yüksektir.

Anahtar Kelimeler

Doku, eşdeğer materyal, form faktör

Molecular form factor data for tissue equivalent materials

Öz

In the diagnostic X-ray energy range, elastic (Coherent) scattering is dominant and can be obtained using an appropriate form factor. When experimental Form Factor data is not available at certain momentum transfer values, molecular form factor data that can be compatible with experimental data should be theoretically obtained. Using these molecular form factor data, molecular coherent scattering coefficients can be calculated, and linear attenuation coefficients of tissue equivalent structures can be estimated. In this study, PMMA, CIRS 70/30, CIRS 50/50, CIRS 30/70, RMI 454, and BR 12, which are equivalent complex molecular structures to human breast tissue, were examined, and the theoretical molecular form factor F(x) values compatible with the experimental form factor values for each were obtained. We believe that our results will find a significant place in the literature and will be beneficial for our future studies and also in the studies of other researchers who make models.

Anahtar Kelimeler

Tissue, equivalent material, form factor

Kaynakça

• Hubbell, J.H., Veigele, W.J., Briggs, E.A., Brown, R.T., Cromer, D.T., Howerton, R.J., Atomic form factors, incoherent scattering functions, and photon scattering cross sections, Journal of Physical and Chemical Reference Data, 4, 471-538, (1975).
• Hubbell, J.H., Øverbø, I., Relativistic atomic form factors and photon coherent scattering cross sections, Journal of Physical and Chemical Reference Data, 8, 69-105, (1979).
• Schaupp, D., Schumacher, M., Smend, F., Rullhusen, P., Hubbell, J.H., Small-angle Rayleigh Scattering of Photons at High Energies: Tabulations of Relativistic HFS Modified Atomic Form Factors, Journal of Physical and Chemical Reference Data, 12, 467-512, (1983).
• Bradley, D.A., Ghose, A.M., Total-atom differential coherent-scattering cross section measurements on Sn and Pb using moderate-energy  rays, Physical Review A, 33, 191-204, (1986).
• Bradley, D.A., Gonçalves, O.D., Kane, P.P., Measurements of photon–atom elastic scattering cross-sections in the photon energy range 1 keV to 4 MeV, Radiation Physics and Chemistry, 56, 125-150, (1999).
• Bradley, D.A., Roy, S.C., Kissel, L., Pratt, R.H., Anomalous scattering effects in elastic photon–atom scattering from biomedically important elements, Radiation Physics and Chemistry, 56, 175-195, (1999).
• Eichler, J., de Barros, S., Gonçalves, O., Gaspar, M., Comparison of Compton and Rayleigh scattering at 145 keV, Physical Review A, 28, 3656-3658, (1983).
• İçelli, O., Erzeneoğlu, S., Coherent scattering of 59.5 keV -rays by 79Au through angles from 451˚ to 1251˚, Spectrochimica Acta Part B, 56, 331-335, (2001).
• Kane, P.P., Elastic scattering of gamma rays and X-rays, Radiation Physics and Chemistry, 74, 402-410, (2005).
• Kane, P.P., Mahajani, J., Basavaraju, G., Priyadarsini, A.K., Scattering of 1.1732-and 1.3325 MeV gamma rays through small angles by carbon, aluminum, copper, tin, and lead, Physical Review A, 28, 1509-1516, (1983).
• Kissel, L., RTAB: the Rayleigh scattering database, Radiation Physics and Chemistry, 59, 185-200, (2000).
• Kissel, L., Pratt, R.H., Roy, S.C., Rayleigh scattering by neutral atoms, 100 eV–10 MeV, Physical Review A, 22, 1970-2004, (1980).
• Nayak, N.G., Siddappa, K., Experimental atomic form factors of some rare earth and heavy elements by coherent scattering of 145.4 keV gamma rays, Radiation Physics and Chemistry, 71, 673-675, (2004).
• Roy, S.C., Kissel, L., Pratt, R.H., Elastic photon scattering at small momentum transfer and validity of form-factor theories, Physical Review A, 27, 285-290, (1983).
• Roy, S.C., Zhou, B., Kissel, L., Pratt, R.H., Rayleigh scattering and form factors, Indian Journal of Physics B, 67, 481-496 , (1993).
• Roy, S.C., Kissel, L., Pratt, R.H., Elastic scattering of photons, Radiation Physics and Chemistry, 56, 3-26, (1999).
• Siddappa, K., Nayak, N.G., Balakrishna, K.M., Lingappa, N., Experimental studies on atomic form factors at 4.808-Å-1 photon momentum transfer, Physical Review A, 39, 5106-5110, (1989).
• Zhou, B., Pratt, R.H., Calculation of Anomalous scattering for ions and atoms, Physica Scripta, 41, 495-498, (1990).
• Böke, A., Calculation of the total Rayleigh scattering cross sections of photons in the energy range of 30-50 keV for Nb and Mo elements, Radiation Physics and Chemistry, 80, 609-613, (2011).
• Böke, A., Linear attenuation coefficients of tissues from 1 keV to 150 keV, Radiation Physics and Chemistry, 102, 49-59, (2014).
• Böke, A., The effect of molecular interference on coherent scattering, Journal of Balıkesir University Institude of Science Technology, 19 (2), 123-136, (2017a).
• Böke, A., The photon interaction cross sections of human cortical bone tissue, Chinese Journal of Physics, 55, 2165–2172, (2017b).
• Böke, A., Coherent X-ray scattering data for plastics, Journal of Balıkesir University Institude of Science Technology, 21 (1), 217-222, (2019).
• Böke, A., Gencer, D., The photon interaction cross sections of blood, Chinese Journal of Physics, 58, 58-62, (2019).
• Poletti, M.E., Gonçalves, O.D., Mazzaro, I., X-ray scattering from human breast tissues and breast-equivalent materials, Physics in Medicine and Biology, 47, 47-63, (2002).
• Midgley, S.M., Measurements of the X-ray linear attenuation coefficient for low atomic number materials at energies 32-66 and 140 keV, Radiation Physics and Chemistry, 72, 525-535, (2005).
• Berger, M.J., Hubbell, J.H., XCOM:photon cross sections on a personal computer, NBSIR 87-3597, Washington, DC:NBS, (1987).
• Hubbell, J.H., Seltzer, S.M., Tables of X-ray mass attenuation coefficients and mass energy absorption coefficients 1 keV to 20 MeV for elements Z=1 to 92 and 48 additionalsubstances of dosimetric interest, Report NISTIR 5632, (1995).
• Tartari, A., Casnati, E., Bonifazzi, C., Baraldi, C., Molecular differential cross sections for x-ray coherent scattering in fat and polymethyl methacrylate, Physics in Medicine and Biology, 42, 2551-2560, (1997).
• Theodorakou, C., Farquharson, M.J., Human soft tissue analysis using x-ray or gamma-ray techniques, Physics in Medicine and Biology, 53, R111-R149, (2008).
• Kim, Y.S., Human Tissues: Chemical Composition and Photon Dosimetry Data, Radiation Research, 57, 38-45, (1974).