Relevant bibliographies by topics / Radiographic magnification

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  1. Journal articles

Academic literature on the topic 'Radiographic magnification'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Radiographic magnification"

1

Nakano, Y., T. Hiraoka, K. Togashi, et al. "Direct radiographic magnification with computed radiography." American Journal of Roentgenology 148, no. 3 (1987): 569–73. http://dx.doi.org/10.2214/ajr.148.3.569.

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2

Camasta, CA, J. Pontious, and RB Boyd. "Quantifying magnification in pedal radiographs." Journal of the American Podiatric Medical Association 81, no. 10 (1991): 545–48. http://dx.doi.org/10.7547/87507315-81-10-545.

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Morphometric comparison between metatarsals on pedal radiographs and preserved bone specimens provides a method to quantify the amount of magnification imparted on a radiographic image. Conversion factors are presented for dorsoplantar and lateral projection images, which are of value in the preoperative assessment of patients. Factors that influence radiographic quality are discussed, with an emphasis on the geometry of projecting an accurate image.
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3

Forness, Mikayla, Zachary Podoll, Benjamin Noonan, and Alexander Chong. "Biomechanical Evaluation of the Accuracy in Radiographic Assessment of Femoral Component Migration Measurement after Total Hip Arthroplasty." Kansas Journal of Medicine 13, no. 1 (2020): 65–70. http://dx.doi.org/10.17161/kjm.v13i1.13622.

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Introduction: Implant subsidence is one criteria utilized to monitor for prosthesis loosening after total hip arthroplasty (THA) with initial implant subsidence assessment often done utilizing plain radiographs. The specific aim of this study was to identify the most reliable references when using plain radiographs to establish an image magnification with the goals being easy to use, inexpensive, reliable, and accurate.
 Methods: Two femoral stem implants (stem lengths: 127mm, 207mm) were utilized to simulate hemiarthroplasty of the hip with composite femurs. Different combinations of femoral stem distances from the radiographic film (ODD), source-detector differences (SDD), hip rotation, and hip flexion were elected. Standardized anterior-posterior pelvis for each parameter combination setup were taken. Radiographic measurements (head diameter, stem length, stem seating length) were undertaken five times by three examiners. Radiographic image magnification factors were generated from two references (head diameter and stem length). Radiograph measurement reproducibility and stem seating length errors using these magnification factors were evaluated.
 Results: High level of repeated measurements reliability was found for head diameter (99 ± 0%) and stem length (90 ± 7%) measurements, whereas seating length measurements were less reliable (76 ± 6%). Stem length error using the femoral head magnification factor yielded 11% accuracy. Stem seating length error using both magnification factors were not reliable (< 7% accuracy). All parameters, except SDD, showed significant effect on calibrated measurement error.
 Conclusions: Current methods of assessing implant subsidence after THA using plain radiographs are inaccurate or reliable. Clinicians should recognize these limitations and be cautious when diagnosing implant stability using plain radiographs alone.
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4

Rakan Shaheen, Dr, Dr Muna Binladin, Dr Alanoud Bin Muammar, et al. "Reliability of digital radiographs in measuring the vertical and horizontal dental implants’ dimensions a retrospective study." International Journal of Dental Research 7, no. 1 (2019): 1. http://dx.doi.org/10.14419/ijdr.v7i1.23529.

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Introduction: Digital radiography can take accurate measurements. In implant dentistry, intraoral periapical (PA), bite-wing (BW) and panoramic (OPG) radiographs are being used, although it had limitations of distortion. This research aims to assess the accuracy of digital radiography in measuring dental implants and to evaluate the SIDEXIS software’s reliability in measuring their dimensions.Materials and Methods: Over 192 implants from 316 radiographs were selected. All radiographs were analyzed using SIDEXIS software. Statistical analysis was performed using SPSS.Results: Statistically significant differences (P < 0.5) between the actual heights and widths compared to the measured radiographic dimensions. Over all the distortion was greatest in OPGs. The magnifications were 2.48mm in height and 0.82mm in width for OPGS, 0.17mm in width for BWs while in PAs it was 1.37mm in height and 0.156mm in width. The magnification was more in maxilla for PAs and OPGs. Anteriorly the PAs had the greatest magnification (2.16mm), and OPGs had the greatest at (3.03mm) in height posteriorly.Conclusion: Digital OPG, PA and Bitewing radiographs are reliable for performing dimensions linear measurements for implants, and PAs have the highest precision. Additionally, SIDEXIS software provided accurate results and can be considered a reliable method for implants’ assessment.
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5

Sharma, A., P. Gilbert, J. Campbell, et al. "Radiographic landmarks for measurement of cranial tibial subluxation in the canine cruciate ligament deficient stifle." Veterinary and Comparative Orthopaedics and Traumatology 25, no. 06 (2012): 478–87. http://dx.doi.org/10.3415/vcot-12-02-0017.

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SummaryObjectives: The primary objective was to develop a repeatable radiographic technique for assessment of cranial tibial subluxation (CTS) and test the intra-observer and inter-observer repeatability of the chosen landmarks. A secondary objective was to determine the effects of digital radiographic magnification on CTS measurement repeatability.Methods: Twenty-three normal canine pelvic limbs were used to determine the magnitude of CTS before and after transection of the cranial cruciate ligament. Mediolateral radiographs were taken with and without fiduciary markers in place. Three investigators measured the CTS using radiographically visible anatomic landmarks at two different magnifications. The total observed variabilities were assessed by inter-observer and intra-observer differences. Paired t-tests were used to determine the effect of magnification and marker presence on CTS measures.Results: Measurement of the CTS from the caudal margin of the intercondylar fossa on the femur to the intercondylar eminence was the most repeatable. Poor correlation between the anatomic landmarks and the fiduciary bone markers was observed. We found no effect of magnification or presence or absence of bone markers on measurement of CTS.Clinical significance: Cranial tibial subluxation can be detected with the most repeatability by measuring between the caudal margin of the intercondylar fossa and the intercondylar eminence. Magnification of the digitized radiographic image had minimal effect on repeatability. This technique can be used for in vivo analysis of the canine cruciate ligament deficient stifle joint.
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6

Kitai, Noriyuki, Yousuke Mukai, Manabu Murabayashi, et al. "Measurement accuracy with a new dental panoramic radiographic technique based on tomosynthesis." Angle Orthodontist 83, no. 1 (2012): 117–26. http://dx.doi.org/10.2319/020412-100.1.

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Abstract Objective: To investigate measurement errors and head positioning effects on radiographs made with new dental panoramic radiograph equipment that uses tomosynthesis. Materials and Methods: Radiographic images of a simulated human head or phantom were made at standard head positions using the new dental panoramic radiograph equipment. Measurement errors were evaluated by comparing with the true values. The phantom was also radiographed at various alternative head positions. Significant differences between measurement values at standard and alternative head positions were evaluated. Magnification ratios of the dimensions at standard and alternative head positions were calculated. Results: The measurement errors were small for all dimensions. On the measurements at 4-mm displacement positions, no dimension was significantly different from the standard value, and all dimensions were within ±5% of the standard values. At 12-mm displacement positions, the magnification ratios for tooth length and mandibular ramus height were within ±5% of the standard values, but those for dental arch width, mandibular width, and mandibular body length were beyond ±5% of the standard values. Conclusions: Measurement errors on radiographs made using the new panoramic radiograph equipment were small in any direction. At 4-mm head displacement positions, no head positioning effect on the measurements was found. At 12-mm head displacement positions, the measurements for vertical dimensions were little affected by head positioning, while those for lateral and anteroposterior dimensions were strongly affected.
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7

Margulis, Alexander R., David J. Ott, Yu Men Chen, David W. Gelfand, Fred Van Swearingen, and Wallace C. Wu. "Radiographic Magnification of Colon Polyps." Journal of Clinical Gastroenterology 8, no. 4 (1986): 486–89. http://dx.doi.org/10.1097/00004836-198608000-00022.

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8

Nakano, Y., K. Togashi, K. Nishimura, et al. "Stomach and duodenum: radiographic magnification using computed radiography (CR)." Radiology 160, no. 2 (1986): 383–87. http://dx.doi.org/10.1148/radiology.160.2.3726117.

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9

Ogata, Mitsuru, Leonor de Castro Monteiro Loffredo, Milton Carlos Kuga, and Gulnara Scaf. "Efficacy of three conditions of radiographic interpretation for assessment root canal length." Journal of Applied Oral Science 13, no. 1 (2005): 83–86. http://dx.doi.org/10.1590/s1678-77572005000100017.

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OBJECTIVE: To compare the efficacy of three conditions of image interpretation for radiographic root measurements and calculating the intra-observer reproducibility of the measurements. MATERIAL AND METHODS: Thirty intra-operative periapical radiographs of maxillary central and lateral incisors were measured, in mm, from the tip of the file to the radiographic apex, using a caliper. Three separate measurements were made of the 30 radiographs. The three measurements for each tooth were averaged and the mean used for further calculations. After a 12-day period, the measurements were repeated. The three experimental viewing conditions used: 1) standard viewbox without masking of background light around the radiograph and without magnification (Visual); 2) standard viewbox with use of a magnifying lens of 2.5x and with background light masked (Magnification); and 3) viewer device that restricts room lighting and enlarges the image by a magnifying lens of 1.75x (Viewer). The mean and standard deviation of the measurements were calculated and used for descriptive analysis. Two-way analysis of variance (ANOVA) was used to evaluate intra-observer and inter-method agreement of the measurements. The measurement error was estimated by Dalhberg's formula. RESULTS: The ANOVA showed no significant differences between measurement sessions, viewing methods, or interaction between observation session and method (p>0.05). The intra-observer measurement error was 0.02 mm for Visual and the Magnification methods and 0.01 mm for the Viewer. CONCLUSION: There does not seem to be any advantage in using viewbox masking or magnification for measuring the distance between the end of the endodontic file and the root apex in maxillary incisors.
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10

Dallera, A., E. M. Brach Del Prever, G. Basile, M. Forti, and P. Gallinaro. "The X-Ray Magnification of the Hip for Preoperative Planning: A New Technique." HIP International 4, no. 2 (1994): 91–98. http://dx.doi.org/10.1177/112070009400400206.

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Precise pre-op planning is fundamental for surgical precision in fit and fill of uncemented prostheses, and reliable and comparable radiographs are necessary for the early diagnosis of loosening. All this can be obtained with a given X-ray magnification factor. The Authors prove that the routinely used methods are misleading and suggest a new technique to obtain a uniform and/or measurable magnification in the A.P. radiograms of the hip. The method gives accurate measurements within a few tenths of a millimetre. It is based on the knowledge of the femoral position in relation to the X-ray film, obtained with a lateral radiographic view, and on mathematical calculation to obtain the X-ray focus height and position. Also in the case of a flexed and externally rotated hip, the non-uniform longitudinal and transverse magnifications can be measured.
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