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| 1 | Current status of low dose multi-detector CT in the urinary tract显示文摘Over the past several years,advances in the technical domain of computed tomography(CT) have influenced the trend of imaging modalities used in the clinical evaluation of the urinary system.Renal collecting systems can be illustrated more precisely with the advent of multi-detector row CT through thinner slices,high speed acquisitions,and enhanced longitudinal spatial resolution resulting in improved reformatted coronal images.On the other hand,a significant increase in exposure to ionizing radiation,especially in the radiosensitive organs,such as the gonads,is a concern with the increased utilization of urinary tract CT.In this article,we discuss the strategies and techniques availablefor reducing radiation dose for a variety of urinary tractCT protocols with metabolic clinical examples.We also reviewed CT for hematuria evaluation and related scan parameter optimization such as,reducing the number of acquisition phases,CT angiography of renal donors and lowering tube potential,when possible. | Mi Kim Sung Sarabjeet Singh Mannudeep K Kalra | 2011 | World Journal of Radiology2011，3，11： | 4 |
| 2 | 有为腹的 CT 的非线性的适应过滤器的申请的放射剂量减小显示文摘 AIM:To evaluate the effect of non-linear adaptive filters (NLAF) on abdominal computed tomography (CT) images acquired at different radiation dose levels.METHODS:Nineteen patients (mean age 61.6 ± 7.9 years,M:F=8:11) gave informed consent for an Institutional Review Board approved prospective study involving acquisition of 4 additional image series (200,150,100,50 mAs and 120 kVp) on a 64 slice multidetector row CT scanner over an identical 10 cm length in the abdomen.The CT images acquired at 150,100 and 50 mAs were processed with the NLAF.Two radiologists reviewed unprocessed and processed images for image quality in a blinded randomized manner.CT dose index volume,dose length product,patient weight,transverse diameters,objective noise and CT numbers wererecorded.Data were analyzed using Analysis of Variance and Wilcoxon signed rank test.RESULTS:Of the 31 lesions detected in abdominal CT images,28 lesions were less than 1 cm in size.Subjective image noise was graded as unacceptable in unprocessed images at 50 and 100 mAs,and in NLAF processed images at 50 mAs only.In NLAF processed images,objective image noise was decreased by 21% (14.4 ± 4/18.2 ± 4.9) at 150 mAs,28.3% (15.7 ± 5.6/21.9 ± 4) at 100 mAs and by 39.4% (18.8 ± 9/30.4 ± 9.2) at 50 mAs compared to unprocessed images acquired at respective radiation dose levels.At 100 mAs the visibility of smaller structures improved from suboptimal in unprocessed images to excellent in NLAF processed images,whereas diagnostic confidence was respectively improved from probably confident to fully confident.CONCLUSION:NLAF lowers image noise,improves the visibility of small structures and maintains lesion conspicuity at down to 100 mAs for abdominal CT. | Sarabjeet Singh Mannudeep K Kalra Mi Kim Sung Anni Back Michael A Blake | 2012 | World Journal of Radiology2012，4，1： | 3 |
| 3 | Lowdose CT of the abdomen: evaluation of image improvement with use of noise reduction filters-pilot study显示文摘 | Mannudeep KK Michael MM Dushyant VS | 2003 | Radiology2003，228，1： | 1 |
| 4 | Abdominal CT:Comparison of Adaptive Statistical Iterative and Filtered BackProjection Reconstruction Techniques显示文摘 | Sarabjeet SB Mannudeep KK Jiang H | 2010 | Radiology2010，257，2： | 1 |
| 5 | Percutaneous lung biopsy in a patient with a cavitating lung mass: indications, technique and complications 显示文摘 | Michael MM Mannudeep KK Ross LT | 2005 | Am J Roentgenol2005，185，： | 1 |
| 6 | Reducing Abdominal CT Radiation Dose With Adaptive Statistical Iterative Reconstruction Technique显示文摘 | Priyanka Prakash Mannudeep K. Kalra Avinash K. Kambadakone Homer Pien Jiang Hsieh Michael A. Blake Dushyant V. Sahani | 2010 | Investigative Radiology2010，，4： | 1 |
| 7 | Size-specific dose estimates: Localizer or transverse abdominal computed tomography images?显示文摘AIM: To investigate effect of body dimensions obtained from localizer radiograph and transverse abdominal computed tomography(CT) images on Size Specific Dose Estimate. METHODS: This study was approved by Institutional Review Board and was compliant with Health Insurance Portability and Accountability Act. Fifty patients with abdominal CT examinations(58 ± 13 years, Male: Female 28:22) were included in this study. Anteriorposterior(AP) and lateral(Lat) diameters were measured at 5 cm intervals from the CT exam localizer radiograph(simple X-ray image acquired for planning the CT exam before starting the scan) and transverse CT images. Average of measured AP and Lat diameters, as well as maximum, minimum and mid location AP and Lat were measured on both image sets. In addition, off centering of patients from the gantry iso-center was calculated from the localizers. Conversion factors from American Association of Physicists in Medicine(AAPM) report 204 were obtained for AP, Lat, AP + Lat, and effective diameter(√ AP * Lat) to determine size specificdose estimate(SSDE) from the CT dose index volume(CTDIvol) recorded from the dose reports. Data were analyzed using SPSS v19. RESULTS: Total number of 5376 measurements was done. In some patients entire body circumference was not covered on either projection radiograph or transverse CT images; hence accurate measurement of AP and Lat diameters was not possible in 11%(278/2488) of locations. Forty one patients were off-centered with mean of 1.9 ± 1.8 cm(range: 0.4-7 cm). Conversion factors for attained diameters were not listed on AAPM look-up tables in 3%(80/2488) of measurements. SSDE values were significantly different compared to CTDIvol, ranging from 32% lower to 74% greater than CTDIvol. CONCLUSION: There is underestimation and overestimation of dose comparing SSDE values to CTDIvol. Localizer radiographs are associated with overestimation of patient size and therefore underestimation of SSDE. | Sarvenaz Pourjabbar Sarabjeet Singh Atul Padole Akshay Saini Michael A Blake Mannudeep K Kalra | 2014 | World Journal of Radiology2014，6，5： | 1 |
| 8 | A 45-Second CT Perfusion Protocol for Rectal Cancers May Not Be Adequate to InferVascular Permeability-Surface Area Products显示文摘 | Mannudeep KK William C | 2006 | Radiology2006，238，2： | 1 |
| 9 | Current status of multi-detector CT urography in imaging of the urinary tract 显示文摘 | Mannudeep K Michael M Dushyant V | 2002 | Diagnostic Radiology2002，31，5： | 1 |
| 10 | Techniques and applications of automatic tube current modulation for CT显示文摘 | Mannudeep K Michael KM Thomas MT etal | 2004 | Radiology2004，23，3： | 1 |
| 11 | Abdominal CT : Compari- son of adoptive statistical iterative and filtered back projection recon- struction techniques 显示文摘 | Sarabjeet S Mannudeep K Jiang H | 2010 | Radiology2010，257，： | 1 |
| 12 | Current status of multi--detector CT urography in imaging of the urinary tract显示文摘 | Mannudeep K Michael M Dushyant V | 2002 | Diagnostic Radiology2002，31，5： | 1 |
| 13 | Adverse reactions to intravenous iodinated contrast media: a primer for radiologists显示文摘 | Saravanan Namasivayam Mannudeep K Kalra William E Torres William C Small | 2006 | Emergency radiology2006，5，12： | 1 |
| 14 | FDG PET/CT in assessment of pulmonary mphangtic eareinomatcsis 显示文摘 | Priyanka P Mannudeep K Amita S | 2010 | AJR2010，94，1： | 1 |
| 15 | Current status of multidetector CT urography in imaging of the urinary tract显示文摘 | Mannudeep K MichaelM Dushyant V | 2002 | Diag Radiol2002，31，5： | 1 |
| 16 | Pheochromocytoma:an imaging chameleon显示文摘 | Michael AB Mannudeep KK Michael MM | 2004 | RadioGraphics2004，24，1： | 1 |
| 17 | Ultra low-dose chest CT using filtered back projection: Comparison of 80-, 100- and 120kVp protocols in a prospective randomized study显示文摘 | Ranish Deedar Ali Khawaja Sarabjeet Singh Rachna Madan Amita Sharma Atul Padole Sarvenaz Pourjabbar Subba Digumarthy Jo-Anne Shepard Mannudeep K. Kalra | 2014 | European Journal of Radiology2014，，10： | 1 |
| 18 | Effect of Contrast Concentration, Tube Potential and Reconstruction Kernels on MDCT Evaluation of Coronary Stents: an in Vitro Study显示文摘 | Gopi Kiran Reddy Sirineni Mannudeep K. Kalra Krishna Pottala Sandra Waldrop Mushabbar Syed Stefan Tigges | 2007 | The International Journal of Cardiovascular Imaging2007，，2： | 1 |
| 19 | Reducing Abdominal CT Radiation Dose With Adaptive Statistical Iterative Reconstruction Technique显示文摘 | Priyanka Prakash Mannudeep K. Kalra Avinash K. Kambadakone Homer Pien Jiang Hsieh Michael A. Blake Dushyant V. Sahani | 2010 | Investigative Radiology2010，，4： | 1 |
| 20 | Radiation Dose Optimization and Thoracic Computed Tomography显示文摘 | Sarabjeet Singh Mannudeep K. Kalra Ranish Deedar Ali Khawaja Atul Padole Sarvenaz Pourjabbar Diego Lira Jo-Anne O. Shepard Subba R. Digumarthy | 2014 | Radiologic Clinics of North America2014，，： | 1 |
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