Ehsan Samei, PhD

Professor of Radiology
Department: Radiology
Division: Radiology - General
Address: 2424 Erwin Road, Suite 302
Ravin Advanced Imaging Labs
Durham, NC 27705
Office Phone: (919) 684-7852
Email: samei@duke.edu
Web: http://www.duke.edu/~samei/

Research Interests

Dr. Ehsan Samei, PhD, is a Professor of Radiology, Medical Physics, Biomedical Engineering, Physics, and Electrical and Computer Engineering at Duke University, where he also serves as the director of Carl E. Ravin Advanced Imaging Laboratories and the founding director of the Clinical Imaging Physics Group. His expertise includes x-ray imaging, theoretical imaging models, simulation methods, and experimental techniques in medical image formation, analysis, assessment, display, and perception. His current research includes methods to develop image quality and dose metrics that are clinically relevant and that can be used for optimum design and utilization of advanced imaging techniques aimed to achieve optimum interpretive, quantitative, and molecular performance. Five areas of recent activities are outlined below.

1. Objective assessment and clinical relevance of image quality
While image quality is a common term in radiology circles, its quantification has proven to be complex, as many factors contribute to the overall degradation of a medical image. Dr. Samei’s research and prior publications have provided a framework for assessing the performance of digital radiography systems, as recently reflected in an international standard on image quality measurements (IEC 62220-1). He is currently pursuing methods to further streamline the assessment methodologies and include other important contributing yet hitherto ignored factors such as scattered radiation. Furthermore, the connection between diagnostic accuracy and the scientific metrics of image quality is not straightforward. Two studies are now in progress to substantiate the relevance of these quantities in radiography (chest and breast) and in computed tomography (pediatric CT). The former investigation, initiated in his laboratory, is supported by a pre-doctoral grant from the DOD. The pediatric CT research initiative, supported by a current industrial grant from GE, aims to investigate strategies to reduce radiation dose in pediatric CT without compromising diagnostic quality.

2. Quantitative imaging
By and large, since its inception, radiology as a discipline has been developed as a qualitative discipline in which physicians “interpret” medical images to gain diagnostic insights. However, current, mostly digital, medical images contain a large amount of information, which if effectively harnessed, can be invaluable in the quantification of the disease, in the assessment of the effectiveness of various therapeutic regimens, and in providing tractability of the medical information toward evidenced-based and patient-specific medicine. The main technical obstacle preventing this potential has been the lack of certainty about the extent to which image data can be analyzed quantitatively in light of various sources of variability (eg, case variability, patient positioning, system variability, etc). However, there is little doubt that the future of radiology is quantitative, and additional research is warranted to lead to that transition.
Dr. Samei has recently initiated a number of research projects aiming to assess the relative magnitude of the sources of variability in diagnostic radiology, and from that to devise approaches by which robust quantitative data can be extracted from medical images. Initial projects have focused on CT and breast tomosynthesis. Additional projects are planned for digital mammography and digital radiography. He is also fostering additional quantitative imaging projects led by other faculty members in RAI Labs. With the preliminary results of these ongoing initiatives, he aims to lead RAI Labs toward a comprehensive program project on quantitative imaging.

3.Molecular imaging
X-ray imaging is now used extensively throughout the world due to its low cost, widespread availability, speed, ease of interpretation, and exquisite representation of anatomy

Publications

Wilson, JM; Christianson, OI; Richard, S; Samei, E. A methodology for image quality evaluation of advanced CT systems. Medical Physics. 2013;40:031908. Abstract

Samei, E; Murphy, S; Christianson, O. DQE of wireless digital detectors: comparative performance with differing filtration schemes. Medical Physics. 2013;40:081910. Abstract

Segars, WP; Bond, J; Frush, J; Hon, S; Eckersley, C; Williams, CH; Feng, J; Tward, DJ; Ratnanather, JT; Miller, MI; Frush, D; Samei, E. Population of anatomically variable 4D XCAT adult phantoms for imaging research and optimization. Medical Physics. 2013;40:043701. Abstract

Chen, B; Marin, D; Richard, S; Husarik, D; Nelson, R; Samei, E. Precision of iodine quantification in hepatic CT: effects of iterative reconstruction with various imaging parameters. American Journal of Roentgenology. 2013;200:W475-W482. Abstract

Solomon, JB; Li, X; Samei, E. Relating noise to image quality indicators in CT examinations with tube current modulation. American Journal of Roentgenology. 2013;200:592-600. Abstract

Copple, C; Robertson, ID; Thrall, DE; Samei, E. Evaluation of two objective methods to optimize kVp and personnel exposure using a digital indirect flat panel detector and simulated veterinary patients. Veterinary Radiology and Ultrasound. 2013;54:9-16. Abstract

Samei, E; Li, X; Chen, B; Reiman, R. The effect of dose heterogeneity on radiation risk in medical imaging. Radiation Protection Dosimetry. 2013;155:42-58. Abstract

Solomon, JB; Christianson, O; Samei, E. Quantitative comparison of noise texture across CT scanners from different manufacturers. Medical Physics. 2012;39:6048-6055. Abstract

Richard, S; Husarik, DB; Yadava, G; Murphy, SN; Samei, E. Towards task-based assessment of CT performance: system and object MTF across different reconstruction algorithms. Medical Physics. 2012;39:4115-4122. Abstract

Samei, E; Button, TM; Orton, CG. Point/Counterpoint: The 2014 initiative can have potentially unintended negative consequences for medical physics in diagnostic imaging and nuclear medicine. Medical Physics. 2012;39:1167-1168. Abstract

Christianson, O; Li, X; Frush, D; Samei, E. Automated size-specific CT dose monitoring program: assessing variability in CT dose. Medical Physics. 2012;39:7131-7139. Abstract

McCollough, CH; Chen, GH; Kalender, W; Leng, S; Samei, E; Taguchi, K; Wang, G; Yu, L; Pettigrew, RI. Achieving routine submillisievert CT scanning: report from the summit on management of radiation dose in CT. Radiology. 2012;264:567-580. Abstract

Samei, E; Majdi-Nasab, N; Dobbins, JT; McAdams, HP. Biplane correlation imaging: a feasibility study based on phantom and human data. Journal of Digital Imaging. 2012;25:137-147. Abstract

Chen, B; Barnhart, H; Richard, S; Colsher, J; Amurao, M; Samei, E. Quantitative CT: technique dependence of volume estimation on pulmonary nodules. Physics in Medicine and Biology. 2012;57:1335-1348. Abstract

Li, X; Samei, E; Williams, CH; Segars, WP; Tward, DJ; Miller, MI; Ratnanather, JT; Paulson, EK; Frush, DP. Effects of protocol and obesity on dose conversion factors in adult body CT. Medical Physics. 2012;39:6550-6571. Abstract

Pollard, BJ; Samei, E; Chawla, AS; Beam, C; Heyneman, LE; Koweek, LM; Martinez-Jimenez, S; Washington, L; Hashimoto, N; McAdams, HP. The effects of ambient lighting in chest radiology reading rooms. Journal of Digital Imaging. 2012;25:520-526. Abstract

Samei, E; Saunders, RS. Dual-energy contrast-enhanced breast tomosynthesis: optimization of beam quality for dose and image quality. Physics in Medicine and Biology. 2011;56:6359-6378. Abstract

Li, X; Samei, E; Segars, WP; Sturgeon, GM; Colsher, JG; Frush, DP. Patient-specific radiation dose and cancer risk for pediatric chest CT. Radiology. 2011;259:862-874. Abstract

Samei, E; Ranger, NT; Dobbins, JT; Ravin, CE. Effective dose efficiency: an application-specific metric of quality and dose for digital radiography. Physics in Medicine and Biology. 2011;56:5099-5118. Abstract

Li, X; Samei, E; Segars, WP; Sturgeon, GM; Colsher, JG; Toncheva, G; Yoshizumi, TT; Frush, DP. Patient-specific radiation dose and cancer risk estimation in CT: part I. development and validation of a Monte Carlo program. Medical Physics. 2011;38:397-407. Abstract

Webb, LJ; Samei, E; Lo, JY; Baker, JA; Ghate, SV; Kim, C; Soo, MS; Walsh, R. Comparative performance of multiview stereoscopic and mammographic display modalities for breast lesion detection. Medical Physics. 2011;38:1972-1980. Abstract

Chen, B; Shorey, J; Saunders, RS; Richard, S; Thompson, J; Nolte, LW; Samei, E. An anthropomorphic breast model for breast imaging simulation and optimization. Academic Radiology. 2011;18:536-546. Abstract

D'Alessandro, B; Madsen, M; Samei, E; Li, X; Wooi-Tan, J; Berbaum, KS; Schartz, K; Caldwell, R; Zuckier, LS. Synthetic positron emission tomography-computed tomography images for use in perceptual studies. Seminars in Nuclear Medicine. 2011;41:437-448. Abstract

Li, X; Samei, E; Barnhart, HX; Gaca, AM; Hollingsworth, CL; Maxfield, CM; Carrico, CW; Colsher, JG; Frush, DP. Lung nodule detection in pediatric chest CT: quantitative relationship between image quality and radiologist performance. Medical Physics. 2011;38:2609-2618. Abstract

Li, X; Samei, E; Segars, WP; Sturgeon, GM; Colsher, JG; Toncheva, G; Yoshizumi, TT; Frush, DP. Patient-specific radiation dose and cancer risk estimation in CT: part II. Application to patients. Medical Physics. 2011;38:408-419. Abstract

Wang, CL; Chea, YW; Boll, DT; Samei, E; Neville, AM; Dale, BM; Merkle, EM. Effect of gadolinium chelate contrast agents on diffusion weighted MR imaging of the liver, spleen, pancreas and kidney at 3 T. European Journal of Radiology. 2011;80:e1-e7. Abstract

Samei, E; Anthony Seibert, J. The tenuous state of clinical medical physics in diagnostic imaging. Medical Physics. 2011;38:iii-iv. Abstract

Richard, S; Samei, E. Quantitative breast tomosynthesis: from detectability to estimability. Medical Physics. 2010;37:6157-6165. Abstract

Richard, S; Samei, E. Quantitative imaging in breast tomosynthesis and CT: comparison of detection and estimation task performance. Medical Physics. 2010;37:2627-2637. Abstract

Marin, D; Nelson, RC; Barnhart, H; Schindera, ST; Ho, LM; Jaffe, TA; Yoshizumi, TT; Youngblood, R; Samei, E. Detection of pancreatic tumors, image quality, and radiation dose during the pancreatic parenchymal phase: effect of a low-tube-voltage, high-tube-current CT technique--preliminary results. Radiology. 2010;256:450-459. Abstract

Fleck, MS; Samei, E; Mitroff, SR. Generalized "satisfaction of search": adverse influences on dual-target search accuracy. Journal of Experimental Psychology: Applied. 2010;16:60-71. Abstract

Marin, D; Nelson, RC; Schindera, ST; Richard, S; Youngblood, RS; Yoshizumi, TT; Samei, E. Low-tube-voltage, high-tube-current multidetector abdominal CT: improved image quality and decreased radiation dose with adaptive statistical iterative reconstruction algorithm--initial clinical experience. Radiology. 2010;254:145-153. Abstract

Shafer, CM; Samei, E; Lo, JY. The quantitative potential for breast tomosynthesis imaging. Medical Physics. 2010;37:1004-1016. Abstract

Ranger, NT; Lo, JY; Samei, E. A technique optimization protocol and the potential for dose reduction in digital mammography. Medical Physics. 2010;37:962-969. Abstract

Samei, E; Ranger, NT; MacKenzie, A; Honey, ID; Dobbins, JT; Ravin, CE. Effective DQE (eDQE) and speed of digital radiographic systems: an experimental methodology. Medical Physics. 2009;36:3806-3817. Abstract

Marin, D; Nelson, RC; Samei, E; Paulson, EK; Ho, LM; Boll, DT; DeLong, DM; Yoshizumi, TT; Schindera, ST. Hypervascular liver tumors: low tube voltage, high tube current multidetector CT during late hepatic arterial phase for detection--initial clinical experience. Radiology. 2009;251:771-779. Abstract

Shepard, SJ; Wang, J; Flynn, M; Gingold, E; Goldman, L; Krugh, K; Leong, DL; Mah, E; Ogden, K; Peck, D; Samei, E; Willis, CE. An exposure indicator for digital radiography: AAPM Task Group 116 (executive summary). Medical Physics. 2009;36:2898-2914. Abstract

Samei, E; Saunders, RS; Badea, CT; Ghaghada, KB; Hedlund, LW; Qi, Y; Yuan, H; Bentley, RC; Mukundan, S. Micro-CT imaging of breast tumors in rodents using a liposomal, nanoparticle contrast agent. International Journal of Nanomedicine. 2009;4:277-282. Abstract

Li, X; Samei, E; Delong, DM; Jones, RP; Gaca, AM; Hollingsworth, CL; Maxfield, CM; Carrico, CW; Frush, DP. Three-dimensional simulation of lung nodules for paediatric multidetector array CT. British Journal of Radiology. 2009;82:401-411. Abstract

Saunders, RS; Samei, E; Lo, JY; Baker, JA. Can compression be reduced for breast tomosynthesis? Monte carlo study on mass and microcalcification conspicuity in tomosynthesis. Radiology. 2009;251:673-682. Abstract

Castella, C; Eckstein, MP; Abbey, CK; Kinkel, K; Verdun, FR; Saunders, RS; Samei, E; Bochud, FO. Mass detection on mammograms: influence of signal shape uncertainty on human and model observers. Optical Society of America Journal A: Optics, Image Science, and Vision. 2009;26:425-436. Abstract

Chawla, AS; Saunders, RS; Singh, S; Lo, JY; Samei, E. Towards optimized acquisition scheme for multiprojection correlation imaging of breast cancer. Academic Radiology. 2009;16:456-463. Abstract

Chawla, AS; Lo, JY; Baker, JA; Samei, E. Optimized image acquisition for breast tomosynthesis in projection and reconstruction space. Medical Physics. 2009;36:4859-4869. Abstract

Pollard, BJ; Samei, E; Chawla, AS; Baker, J; Ghate, S; Kim, C; Soo, MS; Hashimoto, N. The influence of increased ambient lighting on mass detection in mammograms. Academic Radiology. 2009;16:299-304. Abstract

Li, X; Samei, E; DeLong, DM; Jones, RP; Gaca, AM; Hollingsworth, CL; Maxfield, CM; Colsher, JG; Frush, DP. Pediatric MDCT: towards assessing the diagnostic influence of dose reduction on the detection of small lung nodules. Academic Radiology. 2009;16:872-880. Abstract

Li, X; Samei, E. Comparison of patient size-based methods for estimating quantum noise in CT images of the lung. Medical Physics. 2009;36:541-546. Abstract

Saunders, RS; Samei, E. The effect of breast compression on mass conspicuity in digital mammography. Medical Physics. 2008;35:4464-4473. Abstract

Singh, S; Tourassi, GD; Baker, JA; Samei, E; Lo, JY. Automated breast mass detection in 3D reconstructed tomosynthesis volumes: a featureless approach. Medical Physics. 2008;35:3626-3636. Abstract

Pollard, BJ; Chawla, AS; Delong, DM; Hashimoto, N; Samei, E. Object detectability at increased ambient lighting conditions. Medical Physics. 2008;35:2204-2213. Abstract

Samei, E; Ranger, NT; MacKenzie, A; Honey, ID; Dobbins, JT; Ravin, CE. Detector or system? Extending the concept of detective quantum efficiency to characterize the performance of digital radiographic imaging systems. Radiology. 2008;249:926-937. Abstract

Williams, MB; Raghunathan, P; More, MJ; Seibert, JA; Kwan, A; Lo, JY; Samei, E; Ranger, NT; Fajardo, LL; McGruder, A; McGruder, SM; Maidment, AD; Yaffe, MJ; Bloomquist, A; Mawdsley, GE. Optimization of exposure parameters in full field digital mammography. Medical Physics. 2008;35:2414-2423. Abstract

Li, X; Samei, E; Segars, WP; Sturgeon, GM; Colsher, JG; Frush, DP. Patient-specific dose estimation for pediatric chest CT. Medical Physics. 2008;35:5821-5828. Abstract

Samei, E; Ranger, NT; Delong, DM. A comparative contrast-detail study of five medical displays. Medical Physics. 2008;35:1358-1364. Abstract

Fetterly, KA; Blume, HR; Flynn, MJ; Samei, E. Introduction to grayscale calibration and related aspects of medical imaging grade liquid crystal displays. Journal of Digital Imaging. 2008;21:193-207. Abstract

Schindera, ST; Nelson, RC; Mukundan, S; Paulson, EK; Jaffe, TA; Miller, CM; DeLong, DM; Kawaji, K; Yoshizumi, TT; Samei, E. Hypervascular liver tumors: low tube voltage, high tube current multi-detector row CT for enhanced detection--phantom study. Radiology. 2008;246:125-132. Abstract

Chawla, AS; Samei, E; Saunders, RS; Lo, JY; Baker, JA. A mathematical model platform for optimizing a multiprojection breast imaging system. Medical Physics. 2008;35:1337-1345. Abstract

Samei, E; Saunders, RS; Baker, JA; Delong, DM. Digital mammography: effects of reduced radiation dose on diagnostic performance. Radiology. 2007;243:396-404. Abstract

Chawla, AS; Samei, E. Ambient illumination revisited: a new adaptation-based approach for optimizing medical imaging reading environments. Medical Physics. 2007;34:81-90. Abstract

Saunders, RS; Baker, JA; Delong, DM; Johnson, JP; Samei, E. Does image quality matter? Impact of resolution and noise on mammographic task performance. Medical Physics. 2007;34:3971-3981. Abstract

Samei, E; Stebbins, SA; Dobbins, JT; McAdams, HP; Lo, JY. Multiprojection correlation imaging for improved detection of pulmonary nodules. American Journal of Roentgenology. 2007;188:1239-1245. Abstract

Badea, CT; Hedlund, LW; De Lin, M; Mackel, JS; Samei, E; Johnson, GA. Tomographic digital subtraction angiography for lung perfusion estimation in rodents. Medical Physics. 2007;34:1546-1555. Abstract

Samei, E; Poolla, A; Ulissey, MJ; Lewin, JM. Digital mammography: comparative performance of color LCD and monochrome CRT displays. Academic Radiology. 2007;14:539-546. Abstract

Ranger, NT; Samei, E; Dobbins, JT; Ravin, CE. Assessment of detective quantum efficiency: intercomparison of a recently introduced international standard with prior methods. Radiology. 2007;243:785-795. Abstract

Chawla, AS; Samei, E; Saunders, R; Abbey, C; Delong, D. Effect of dose reduction on the detection of mammographic lesions: a mathematical observer model analysis. Medical Physics. 2007;34:3385-3398. Abstract

Ruschin, M; Timberg, P; Båth, M; Hemdal, B; Svahn, T; Saunders, RS; Samei, E; Andersson, I; Mattsson, S; Chakrabort, DP; Tingber, A. Dose dependence of mass and microcalcification detection in digital mammography: free response human observer studies. Medical Physics. 2007;34:400-407. Abstract

Borasi, G; Samei, E; Bertolini, M; Nitrosi, A; Tassoni, D. Contrast-detail analysis of three flat panel detectors for digital radiography. Medical Physics. 2006;33:1707-1719. Abstract

Hoe, CL; Samei, E; Frush, DP; Delong, DM. Simulation of liver lesions for pediatric CT. Radiology. 2006;238:699-705. Abstract

Dobbins, JT; Samei, E; Ranger, NT; Chen, Y. Intercomparison of methods for image quality characterization. II. Noise power spectrum. Medical Physics. 2006;33:1466-1475. Abstract

Saunders, R; Samei, E; Baker, J; Delong, D. Simulation of mammographic lesions. Academic Radiology. 2006;13:860-870. Abstract

Siegel, E; Krupinski, E; Samei, E; Flynn, M; Andriole, K; Erickson, B; Thomas, J; Badano, A; Seibert, JA; Pisano, ED. Digital mammography image quality: image display. Journal of the American College of Radiology. 2006;3:615-627. Abstract

Saunders, RS; Samei, E; Baker, J; Delong, D; Soo, MS; Walsh, R; Pisano, E; Kuzmiak, CM; Pavic, D. Comparison of LCD and CRT displays based on efficacy for digital mammography. Academic Radiology. 2006;13:1317-1326. Abstract

McAdams, HP; Samei, E; Dobbins, J; Tourassi, GD; Ravin, CE. Recent advances in chest radiography. Radiology. 2006;241:663-683. Abstract

Badano, A; Schneider, S; Samei, E. Visual assessment of angular response in medical liquid crystal displays. Journal of Digital Imaging. 2006;19:240-248. Abstract

Boyce, SJ; Samei, E. Imaging properties of digital magnification radiography. Medical Physics. 2006;33:984-996. Abstract

McKinley, RL; Tornai, MP; Brzymialkiewicz, C; Madhav, P; Samei, E; Bowsher, JE. Analysis of a novel offset cone-beam computed mammotomography system geometry for accomodating various breast sizes. Physica Medica: an international journal devoted to the applications of physics to medicine and biology. 2006;21 Suppl 1:48-55. Abstract

Samei, E; Wright, SL. Viewing angle performance of medical liquid crystal displays. Medical Physics. 2006;33:645-654. Abstract

Saunders, RS; Samei, E. Resolution and noise measurements of five CRT and LCD medical displays. Medical Physics. 2006;33:308-319. Abstract

Lin, MD; Samei, E; Badea, CT; Yoshizumi, TT; Johnson, GA. Optimized radiographic spectra for small animal digital subtraction angiography. Medical Physics. 2006;33:4249-4257. Abstract

Saunders, RS; Samei, E. Improving mammographic decision accuracy by incorporating observer ratings with interpretation time. British Journal of Radiology. 2006;79 Spec No 2:S117-S122. Abstract

Samei, E; Ranger, NT; Dobbins, JT; Chen, Y. Intercomparison of methods for image quality characterization. I. Modulation transfer function. Medical Physics. 2006;33:1454-1465. Abstract

Samei, E; Buhr, E; Granfors, P; Vandenbroucke, D; Wang, X. Comparison of edge analysis techniques for the determination of the MTF of digital radiographic systems. Physics in Medicine and Biology. 2005;50:3613-3625. Abstract

Ranger, NT; Samei, E; Dobbins, JT; Ravin, CE. Measurement of the detective quantum efficiency in digital detectors consistent with the IEC 62220-1 standard: practical considerations regarding the choice of filter material. Medical Physics. 2005;32:2305-2311. Abstract

Samei, E. AAPM/RSNA physics tutorial for residents: technological and psychophysical considerations for digital mammographic displays. Radiographics. 2005;25:491-501. Abstract

Samei, E; Dobbins, JT; Lo, JY; Tornai, MP. A framework for optimising the radiographic technique in digital X-ray imaging. Radiation Protection Dosimetry. 2005;114:220-229. Abstract

Samei, E; Badano, A; Chakraborty, D; Compton, K; Cornelius, C; Corrigan, K; Flynn, MJ; Hemminger, B; Hangiandreou, N; Johnson, J; Moxley-Stevens, DM; Pavlicek, W; Roehrig, H; Rutz, L; Shepard, J; Uzenoff, RA; Wang, J; Willis, CE; AAPM TG18. Assessment of display performance for medical imaging systems: executive summary of AAPM TG18 report. Medical Physics. 2005;32:1205-1225. Abstract

Samei, E; Lo, JY; Yoshizumi, TT; Jesneck, JL; Dobbins, JT; Floyd, CE; McAdams, HP; Ravin, CE. Comparative scatter and dose performance of slot-scan and full-field digital chest radiography systems. Radiology. 2005;235:940-949. Abstract

Saunders, RS; Samei, E; Jesneck, JL; Lo, JY. Physical characterization of a prototype selenium-based full field digital mammography detector. Medical Physics. 2005;32:588-599. Abstract

Neitzel, U; Günther-Kohfahl, S; Borasi, G; Samei, E. Determination of the detective quantum efficiency of a digital x-ray detector: comparison of three evaluations using a common image data set. Medical Physics. 2004;31:2205-2211. Abstract

McKinley, RL; Tornai, MP; Samei, E; Bradshaw, ML. Simulation study of a quasi-monochromatic beam for x-ray computed mammotomography. Medical Physics. 2004;31:800-813. Abstract

Jung, H; Kim, HJ; Kang, WS; Yoo, SK; Fujioka, K; Hasegawa, M; Samei, E. Assessment of flat panel LCD primary class display performance based on AAPM TG 18 acceptance protocol. Medical Physics. 2004;31:2155-2164. Abstract

Samei, E; Rowberg, A; Avraham, E; Cornelius, C. Toward clinically relevant standardization of image quality. Journal of Digital Imaging. 2004;17:271-278. Abstract

Samei, E; Saunders, RS; Lo, JY; Dobbins, JT; Jesneck, JL; Floyd, CE; Ravin, CE. Fundamental imaging characteristics of a slot-scan digital chest radiographic system. Medical Physics. 2004;31:2687-2698. Abstract

Saunders, RS; Samei, E; Hoeschen, C. Impact of resolution and noise characteristics of digital radiographic detectors on the detectability of lung nodules. Medical Physics. 2004;31:1603-1613. Abstract

Samei, E; Wright, SL. Luminance and contrast performance of liquid crystal displays for mammographic applications. Technology in Cancer Research and Treatment. 2004;3:429-436. Abstract

Samei, E; Seibert, JA; Andriole, K; Badano, A; Crawford, J; Reiner, B; Flynn, MJ; Chang, P. AAPM/RSNA tutorial on equipment selection: PACS equipment overview: general guidelines for purchasing and acceptance testing of PACS equipment. Radiographics. 2004;24:313-334. Abstract

Turner, SR; Samei, E; Hertzberg, BS; DeLong, DM; Vargas-Voracek, R; Singer, A; Maynor, CH; Kliewer, MA. Sonography of fetal choroid plexus cysts: detection depends on cyst size and gestational age. Journal of Ultrasound in Medicine. 2003;22:1219-1227. Abstract

Samei, E; Flynn, MJ; Peterson, E; Eyler, WR. Subtle lung nodules: influence of local anatomic variations on detection. Radiology. 2003;228:76-84. Abstract

Samei, E; Hill, JG; Frey, GD; Southgate, WM; Mah, E; Delong, D. Evaluation of a flat panel digital radiographic system for low-dose portable imaging of neonates. Medical Physics. 2003;30:601-607. Abstract

Saunders, RS; Samei, E. A method for modifying the image quality parameters of digital radiographic images. Medical Physics. 2003;30:3006-3017. Abstract

Dobbins, JT; Samei, E; Chotas, HG; Warp, RJ; Baydush, AH; Floyd, CE; Ravin, CE. Chest radiography: optimization of X-ray spectrum for cesium iodide-amorphous silicon flat-panel detector. Radiology. 2003;226:221-230. Abstract

Samei, E; Flynn, MJ. An experimental comparison of detector performance for direct and indirect digital radiography systems. Medical Physics. 2003;30:608-622. Abstract

Samei, E. Image quality in two phosphor-based flat panel digital radiographic detectors. Medical Physics. 2003;30:1747-1757. Abstract

Samei, E; Flynn, MJ. An experimental comparison of detector performance for computed radiography systems. Medical Physics. 2002;29:447-459. Abstract

Samei, E; Seibert, JA; Willis, CE; Flynn, MJ; Mah, E; Junck, KL. Performance evaluation of computed radiography systems. Medical Physics. 2001;28:361-371. Abstract

Mah, E; Samei, E; Peck, DJ. Evaluation of a quality control phantom for digital chest radiography. Journal of applied clinical medical physics [electronic resource] / American College of Medical Physics. 2001;2:90-101. Abstract

Kearfott, KJ; Han, S; Wagner, EC; Samei, E; Wang, CK. Numerical simulation of a TLD pulsed laser-heating scheme for determination of shallow dose and deep dose in low-LET radiation fields. Applied Radiation and Isotopes. 2000;52:1419-1429. Abstract

Ryan, MT; Spicer, KM; Frei-Lahr, D; Samei, E; Frey, GD; Hargrove, H; Bloodworth, G. Health physics consequences of out-patient treatment of non-Hodgkin's lymphoma with 131I-radiolabeled anti-B1 antibody. Health Physics: the radiation safety journal. 2000;79:S52-S55. Abstract

Samei, E; Flynn, MJ; Eyler, WR. Detection of subtle lung nodules: relative influence of quantum and anatomic noise on chest radiographs. Radiology. 1999;213:727-734. Abstract

Flynn, MJ; Samei, E. Experimental comparison of noise and resolution for 2k and 4k storage phosphor radiography systems. Medical Physics. 1999;26:1612-1623. Abstract

Beute, GH; Flynn, MJ; Eyler, WR; Samei, E; Spizarny, DL; Zylak, CJ. Chest radiographic image quality: comparison of asymmetric screen-film, digital storage phosphor, and digital selenium drum systems--preliminary study. Radiographics. 1998;18:745-754. Abstract

Samei, E; Flynn, MJ; Reimann, DA. A method for measuring the presampled MTF of digital radiographic systems using an edge test device. Medical Physics. 1998;25:102-113. Abstract

Samei, E; Flynn, MJ; Eyler, WR. Simulation of subtle lung nodules in projection chest radiography. Radiology. 1997;202:117-124. Abstract

Kearfott, KJ; Han, S; McMahan, KL; Samei, E. Sensitivity of a mixed field dosimetry algorithm to uncertainties in thermoluminescent element readings. Health Physics: the radiation safety journal. 1995;68:340-349. Abstract

Samei, E; Kearfott, KJ. A limited bibliography of the Federal Government-funded human radiation experiments. Health Physics: the radiation safety journal. 1995;69:885-891. Abstract