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Determination of dose indicators for full-field mammography and digital breast tomosynthesis
No full textPeriodično praćenje apsorbirane doze predane pacijentu tijekom dijagnostičkih postupaka te određivanje tipičnih vrijednosti doznih indikatora za najčešće pretrage jedan je od važnih koraka u procesu optimizacije. Za mamografske postupke u Republici Hrvatskoj dozni indikator za koji se uspostavlja tipična vrijednost je srednja glandularna doza. Dijagnostička referentna razina za srednju glandularnu dozu po jednoj projekciji je definirana za debljinu dojke 5,5 cm ± 0,5 cm za standardne mamografske postupke. Trenutno nije definirana tipična vrijednost srednje glandularne doze za digitalnu tomosintezu dojke. Klinički bolnički centar Rijeka prva je zdravstvena ustanova u Republici Hrvatskoj u kojoj je uspostavljen sustav osiguranja kvalitete te su fizičari sa Zavoda za medicinsku fiziku i zaštitu od zračenja čiji su poslovi i radni zadaci vezani za primjenu fizike u dijagnostičkoj i intervencijskoj radiologiji odredili tipične vrijednosti doznih indikatora za najčešće dijagnostičke postupke koji se temelje na primjeni snopova X-zraka. Budući da je te vrijednosti potrebno periodično revidirati i usporediti s nacionalnim referentnim razinama, u sklopu ovog rada provedena je revizija tipičnih vrijednosti srednje glandularne doze na uređaju za mamografiju Hologic Selenia Dimensions koji se koristi na Kliničkom zavodu za dijagnostičku i intervencijsku radiologiju, KBC Rijeka. Osim tipičnih vrijednosti za standardne mamografske postupke izračunate su i vrijednosti za digitalnu tomosintezu dojke. Dobivene vrijednosti su uspoređene s podacima iz recentne međunarodne literature.
Ciljevi ovog rada bili su odrediti tipične vrijednosti doznih indikatora za postupke planarne mamografije i digitalne tomosinteze dojke na Kliničkom zavodu za dijagnostičku i intervencijsku radiologiju, KBC Rijeka, utvrditi postoji li statistički značajna razlika u vrijednostima doznih indikatora za planarne mamografske postupke i digitalnu tomosintezu dojke u KBC Rijeka, usporediti dobivene tipične vrijednosti doznih indikatora za planarne mamografske postupke s vrijednostima nacionalnih dijagnostičkih referentnih razina u Republici Hrvatskoj te usporediti dobivene tipične vrijednosti doznih indikatora za digitalnu tomosintezu dojke s vrijednostima objavljenim u recentnim međunarodnim publikacijama.
Ukupan broj pacijenata kojima je učinjena mamografija u zadanom razdoblju bio je 1891. Nakon isključenja određenih grupa pacijenata analizirani su podaci za ukupno 135 žena podvrgnutih standardnom mamografskom postupku te 285 žena kojima je učinjena digitalna tomosinteza. Medijan vrijednosti srednje glandularne doze za standardnu mamografiju za debljinu komprimirane dojke 5,5 cm ± 0,5 cm u KBC Rijeka iznosi 1,51 mGy po jednoj projekciji, dok za digitalnu tomosintezu iznosi 1,99 mGy. Rezultat t-testa za nezavisne uzorke pokazao je da postoji statistički značajna razlika između srednje glandularne doze za standardnu mamografiju i digitalnu tomosintezu na razini značajnosti od 5%. Utvrđeno je da su dobivene tipične vrijednosti doznih indikatora u KBC Rijeka za planarne mamografske postupke manje od nacionalnih dijagnostičkih referentnih razina u Republici Hrvatskoj. Dobivene tipične vrijednosti doznih indikatora za digitalnu tomosintezu dojke usporedive su s podacima objavljenim u recentnim međunarodnim publikacijama. Rezultati ovog rada pokazali su da su vrijednosti srednje glandularne doze u KBC Rijeka u skladu s nacionalnim i međunarodnim preporukama.Regular monitoring of the absorbed dose delivered to the patient during diagnostic procedures and determination of typical values of dose indicators is an important step of the optimization process. In the Republic of Croatia, the dose indicator for mammography procedures is the average glandular dose. The national diagnostic reference value for average glandular dose per projection is defined for a breast thickness of 5,5 cm ± 0,5 cm for standard mammography procedures. The national diagnostic reference value for average glandular dose for digital breast tomosynthesis has not yet been defined. Clinical Hospital Center Rijeka was the first healthcare facility in the Republic of Croatia to implement a comprehensive quality assurance program and to establish typical values of dose indicators for the most common diagnostic procedures based on the use of X-ray beams. Since a regular review of typical values and comparison with national reference values is necessary, a review of typical values of mean glandular dose for the Hologic Selenia Dimensions mammography device used in the Department of Diagnostic and Interventional Radiology at Clinical Hospital Center Rijeka was performed as part of this work. In addition to typical values for standard mammography procedures, typical values for digital breast tomosynthesis were also determined. The determined values were compared with recently published data from.
The objectives of this work were: to determine the typical values of dose indicators for planar mammography procedures and digital breast tomosynthesis at the Department of Diagnostic and Interventional Radiology of Clinical Hospital Center Rijeka, to examine a statistically significance of the difference in the values of dose indicators for planar mammography procedures and digital breast tomosynthesis in the Clinical Hospital Center Rijeka, to determine whether the obtained typical values of dose indicators for planar mammographic procedures are in confidence with the national diagnostic reference values in the Republic of Croatia, and to determine whether the obtained typical values of dose indicators for digital breast tomosynthesis are comparable with the data published in recent publications.
The total number of patients in the indicated period was 1891, and after exclusion of certain groups of patients, data from a total of 135 women who underwent standard mammography and 285 women who underwent digital tomosynthesis were analyzed.
The median value, i.e., the typical value of the average glandular dose for standard mammography with a compressed breast thickness of 5,5 cm ± 0,5 cm at the Clinical Hospital Center Rijeka is 1,51 mGy per projection, while for digital tomosynthesis it is 1,99 mGy. The result of the independent samples t-test showed that there is a statistically significant difference between the mean glandular dose for standard mammography and digital tomosynthesis at the 5% significance level. It was found that the typical values of dose indicators established in the Clinical Hospital Center Rijeka for planar mammography procedures are lower than the national diagnostic reference values in the Republic of Croatia. The determined typical values of dose indicators for digital breast tomosynthesis are comparable with the values published in recent publications. The results of this work show that mammography practice in Clinical Hospital Center Rijeka is in accordance with national and international recommendations
Determination of dose indicators for full-field mammography and digital breast tomosynthesis
No full textPeriodično praćenje apsorbirane doze predane pacijentu tijekom dijagnostičkih postupaka te određivanje tipičnih vrijednosti doznih indikatora za najčešće pretrage jedan je od važnih koraka u procesu optimizacije. Za mamografske postupke u Republici Hrvatskoj dozni indikator za koji se uspostavlja tipična vrijednost je srednja glandularna doza. Dijagnostička referentna razina za srednju glandularnu dozu po jednoj projekciji je definirana za debljinu dojke 5,5 cm ± 0,5 cm za standardne mamografske postupke. Trenutno nije definirana tipična vrijednost srednje glandularne doze za digitalnu tomosintezu dojke. Klinički bolnički centar Rijeka prva je zdravstvena ustanova u Republici Hrvatskoj u kojoj je uspostavljen sustav osiguranja kvalitete te su fizičari sa Zavoda za medicinsku fiziku i zaštitu od zračenja čiji su poslovi i radni zadaci vezani za primjenu fizike u dijagnostičkoj i intervencijskoj radiologiji odredili tipične vrijednosti doznih indikatora za najčešće dijagnostičke postupke koji se temelje na primjeni snopova X-zraka. Budući da je te vrijednosti potrebno periodično revidirati i usporediti s nacionalnim referentnim razinama, u sklopu ovog rada provedena je revizija tipičnih vrijednosti srednje glandularne doze na uređaju za mamografiju Hologic Selenia Dimensions koji se koristi na Kliničkom zavodu za dijagnostičku i intervencijsku radiologiju, KBC Rijeka. Osim tipičnih vrijednosti za standardne mamografske postupke izračunate su i vrijednosti za digitalnu tomosintezu dojke. Dobivene vrijednosti su uspoređene s podacima iz recentne međunarodne literature.
Ciljevi ovog rada bili su odrediti tipične vrijednosti doznih indikatora za postupke planarne mamografije i digitalne tomosinteze dojke na Kliničkom zavodu za dijagnostičku i intervencijsku radiologiju, KBC Rijeka, utvrditi postoji li statistički značajna razlika u vrijednostima doznih indikatora za planarne mamografske postupke i digitalnu tomosintezu dojke u KBC Rijeka, usporediti dobivene tipične vrijednosti doznih indikatora za planarne mamografske postupke s vrijednostima nacionalnih dijagnostičkih referentnih razina u Republici Hrvatskoj te usporediti dobivene tipične vrijednosti doznih indikatora za digitalnu tomosintezu dojke s vrijednostima objavljenim u recentnim međunarodnim publikacijama.
Ukupan broj pacijenata kojima je učinjena mamografija u zadanom razdoblju bio je 1891. Nakon isključenja određenih grupa pacijenata analizirani su podaci za ukupno 135 žena podvrgnutih standardnom mamografskom postupku te 285 žena kojima je učinjena digitalna tomosinteza. Medijan vrijednosti srednje glandularne doze za standardnu mamografiju za debljinu komprimirane dojke 5,5 cm ± 0,5 cm u KBC Rijeka iznosi 1,51 mGy po jednoj projekciji, dok za digitalnu tomosintezu iznosi 1,99 mGy. Rezultat t-testa za nezavisne uzorke pokazao je da postoji statistički značajna razlika između srednje glandularne doze za standardnu mamografiju i digitalnu tomosintezu na razini značajnosti od 5%. Utvrđeno je da su dobivene tipične vrijednosti doznih indikatora u KBC Rijeka za planarne mamografske postupke manje od nacionalnih dijagnostičkih referentnih razina u Republici Hrvatskoj. Dobivene tipične vrijednosti doznih indikatora za digitalnu tomosintezu dojke usporedive su s podacima objavljenim u recentnim međunarodnim publikacijama. Rezultati ovog rada pokazali su da su vrijednosti srednje glandularne doze u KBC Rijeka u skladu s nacionalnim i međunarodnim preporukama.Regular monitoring of the absorbed dose delivered to the patient during diagnostic procedures and determination of typical values of dose indicators is an important step of the optimization process. In the Republic of Croatia, the dose indicator for mammography procedures is the average glandular dose. The national diagnostic reference value for average glandular dose per projection is defined for a breast thickness of 5,5 cm ± 0,5 cm for standard mammography procedures. The national diagnostic reference value for average glandular dose for digital breast tomosynthesis has not yet been defined. Clinical Hospital Center Rijeka was the first healthcare facility in the Republic of Croatia to implement a comprehensive quality assurance program and to establish typical values of dose indicators for the most common diagnostic procedures based on the use of X-ray beams. Since a regular review of typical values and comparison with national reference values is necessary, a review of typical values of mean glandular dose for the Hologic Selenia Dimensions mammography device used in the Department of Diagnostic and Interventional Radiology at Clinical Hospital Center Rijeka was performed as part of this work. In addition to typical values for standard mammography procedures, typical values for digital breast tomosynthesis were also determined. The determined values were compared with recently published data from.
The objectives of this work were: to determine the typical values of dose indicators for planar mammography procedures and digital breast tomosynthesis at the Department of Diagnostic and Interventional Radiology of Clinical Hospital Center Rijeka, to examine a statistically significance of the difference in the values of dose indicators for planar mammography procedures and digital breast tomosynthesis in the Clinical Hospital Center Rijeka, to determine whether the obtained typical values of dose indicators for planar mammographic procedures are in confidence with the national diagnostic reference values in the Republic of Croatia, and to determine whether the obtained typical values of dose indicators for digital breast tomosynthesis are comparable with the data published in recent publications.
The total number of patients in the indicated period was 1891, and after exclusion of certain groups of patients, data from a total of 135 women who underwent standard mammography and 285 women who underwent digital tomosynthesis were analyzed.
The median value, i.e., the typical value of the average glandular dose for standard mammography with a compressed breast thickness of 5,5 cm ± 0,5 cm at the Clinical Hospital Center Rijeka is 1,51 mGy per projection, while for digital tomosynthesis it is 1,99 mGy. The result of the independent samples t-test showed that there is a statistically significant difference between the mean glandular dose for standard mammography and digital tomosynthesis at the 5% significance level. It was found that the typical values of dose indicators established in the Clinical Hospital Center Rijeka for planar mammography procedures are lower than the national diagnostic reference values in the Republic of Croatia. The determined typical values of dose indicators for digital breast tomosynthesis are comparable with the values published in recent publications. The results of this work show that mammography practice in Clinical Hospital Center Rijeka is in accordance with national and international recommendations
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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