Publications - Dr. Paul Johns, Department of Physics, Carleton University

Selected Publications

Current and recent topics

D.C. Kemdirim and P.C. Johns, "Spectrum optimization for x-ray dual-mode imager comprising radiography and coherent scatter", SPIE Defense & Commercial Sensing 2024: Anomaly Detection and Imaging with X Rays (ADIX) IX, Proc. SPIE 13043, 13043-03-1 to -03-12 (2024). dx.doi.org/10.1117/12.3005049
C. Dydula and P.C. Johns, "Development and assessment of an x-ray tube-based multi-beam x-ray scatter projection imaging system", Review of Scientific Instruments 92, 115106-1-12 (2021). dx.doi.org/10.1063/5.0055900 [Pubmed: 34852551].
C. Dydula, T. Xu and P.C. Johns, "Design and development of a rotating-anode x-ray tube coherent scatter projection imaging system", SPIE Defense & Commercial Sensing 2020: Anomaly Detection and Imaging with X Rays (ADIX) V, Proc. SPIE 11404, 11404-08-1 to -08-13 (2020). dx.doi.org/10.1117/12.2554209

Older

C. Dydula, G. Belev and P.C. Johns, "Development and assessment of a multi-beam continuous-phantom-motion x-ray scatter projection imaging system", Review of Scientific Instruments 90, 035104-1-13 (2019). dx.doi.org/10.1063/1.5043393 [Pubmed: 30927807].
C. Dydula, G. Belev and P.C. Johns, "Accelerated x-ray scatter projection imaging using multiple continuously-moving pencil beams", SPIE Medical Imaging 2017: Physics of Medical Imaging, Proc. SPIE 10132, 10132-J4-1 to -J4-13 (2017). dx.doi.org/10.1117/12.2253720
K. Landheer and P.C. Johns, "Synchrotron-based coherent scatter x-ray projection imaging using an array of monoenergetic pencil beams", Review of Scientific Instruments 83, 095114-1-7 (2012). dx.doi.org/10.1063/1.4754124 [Pubmed: 23020426].
K.A. Landheer and P.C. Johns, "Coherent x-ray scatter projection imaging using an array of mono-energetic pencil beams", Proc. SPIE 8358, 8358-1O-1 to -1O-10 (2012). dx.doi.org/10.1117/12.918666
B.W. King, K.A. Landheer, and P.C. Johns, "X-ray coherent scattering form factors of tissues, water and plastics using energy dispersion", Physics in Medicine and Biology 56, 4377-4397 (2011). dx.doi.org/10.1088/0031-9155/56/14/010 [Pubmed: 21709341].
B.W. King and P.C. Johns, "An energy-dispersive technique to measure x-ray coherent scattering form factors of amorphous materials", Physics in Medicine and Biology 55, 855-871 (2010). dx.doi.org/10.1088/0031-9155/55/3/020 [Pubmed: 20071771].
B.W. King and P.C. Johns, "A sub-matrix method for extracting x-ray coherent scattering form factors from image plate data", Proc. SPIE 6510, 6510-0R-1 to -0R-12 (2007). dx.doi.org/10.1117/12.707962
B.W. King and P.C. Johns, "Measurement of coherent scattering form factors using an image plate”, Physics in Medicine and Biology 53, 5977-5990 (2008); Erratum, 54, 6437 (2009). dx.doi.org/10.1088/0031-9155/53/21/006 [Pubmed: 18836216].
P.C. Johns and M.P. Wismayer, "Measurement of coherent x-ray scatter form factors for amorphous materials using diffractometers", Physics in Medicine and Biology 49, 5233-5250 (2004). dx.doi.org/10.1088/0031-9155/49/23/003 [Pubmed: 15656274].
Note: awarded the Sylvia Fedoruk Prize in Medical Physics of the Saskatchewan Cancer Agency at the July 2005 COMP/CCPM conference for the "best paper" in the field of medical physics for work done wholly or mainly in a Canadian institution the previous year.
M. Nisar and P.C. Johns, "Coherent scatter x-ray imaging of plastic/water phantoms", Proc. SPIE 5578, 445-453 (2004). dx.doi.org/10.1117/12.567128
M. Li, M.S. Dixit, and P.C. Johns, "Photon-counting digital radiography using high-pressure xenon filled detectors", Nuclear Instruments and Methods in Physics Research A 471, 215-221 (2001). dx.doi.org/10.1016/S0168-9002(01)01102-0
R.J. Leclair and P.C. Johns, "X-ray forward-scatter imaging: Experimental validation of model", Medical Physics 28, 210-219 (2001). dx.doi.org/10.1118/1.1339226
R.J. Leclair and P.C. Johns, "A semi-analytic model to investigate the potential applications of x-ray scatter imaging", Medical Physics 25, 1008-1020 (1998). dx.doi.org/10.1118/1.598279
P.C. Johns and R.M. Beauregard, "Incorporation of scattered radiation into dual-energy radiologic theory and application to mammography", Medical Physics 21, 1455-1462 (1994). dx.doi.org/10.1118/1.597404
P.L. Pattee, P.C. Johns, and R.J. Chambers, "Radiation risk to patients from Percutaneous Transluminal Coronary Angioplasty", J. of the American College of Cardiology 22, 1044-1051 (1993). dx.doi.org/10.1016/0735-1097(93)90414-V
J.K. Older and P.C. Johns, "Matrix formulation of Computed Tomogram reconstruction", Physics in Medicine and Biology 38, 1051-1064 (1993). dx.doi.org/10.1088/0031-9155/38/8/004
P.C. Johns and M.J. Yaffe, "X-ray characterisation of normal and neoplastic breast tissues", Physics in Medicine and Biology 32, 675-695 (1987). dx.doi.org/10.1088/0031-9155/32/6/002
P.C. Johns and M.J. Yaffe, "Correction of pulse-height spectra for peak pile-up effects using periodic and random pulse generators", Nuclear Instruments and Methods in Physics Research A 255, 559-581 (1987). dx.doi.org/10.1016/0168-9002(87)91227-7
P.C. Johns and M.J. Yaffe, "Theoretical optimization of dual-energy x-ray imaging with application to mammography", Medical Physics 12, 289-296 (1985). dx.doi.org/10.1118/1.595766
P.C. Johns and M.J. Yaffe, "Coherent scatter in diagnostic radiology", Medical Physics 10, 40-50 (1983). dx.doi.org/10.1118/1.595443
P.C. Johns and M.J. Yaffe, "Scattered radiation in fan beam imaging systems", Medical Physics 9, 231-239 (1982). dx.doi.org/10.1118/1.595076

Tutorial paper

P.C. Johns, "Understanding and comparing ionizing radiation doses to patients", invited article in the Canadian Journal of Medical Radiation Technology 30, 138-148 (1999). Click here to open scanned copy as a pdf. (file size = 6 MB).