Hermann, K.-P.

[["dc.bibliographiccitation.firstpage","256"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Der Radiologe"],["dc.bibliographiccitation.lastpage","260"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Funke, M."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:31:03Z"],["dc.date.available","2018-11-07T10:31:03Z"],["dc.date.issued","2002"],["dc.description.abstract","The establishment of digital mammography systems constitutes a slow process,the reason for this being the general need of particular image quality in mammography. This article provides an overview of the physical basis of digital mammography with high image quality and dose as low as reasonably achievable. The trade-off of high contrast resolution and effective quantum efficiency of the imaging system on the one hand, and the demand of high spatial resolution or very small pixel size on the other hand is discussed. The actual status of the available digital detector technology for mammography is described. The digital systems presently available are superior to conventional screen-film mammographic systems with respect to contrast resolution. An outlook on possible further developments in the field of digital mammography is presented."],["dc.identifier.doi","10.1007/s00117-002-0734-1"],["dc.identifier.isi","000175618200002"],["dc.identifier.pmid","12063731"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44008"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0033-832X"],["dc.title","Physical aspects of digital mammography technology"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","478"],["dc.bibliographiccitation.issue","907"],["dc.bibliographiccitation.journal","British Journal of Radiology"],["dc.bibliographiccitation.lastpage","482"],["dc.bibliographiccitation.volume","76"],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:37:52Z"],["dc.date.available","2018-11-07T10:37:52Z"],["dc.date.issued","2003"],["dc.description.abstract","The aim of this study was to evaluate the potential for radiation dose reduction by using other beam qualities in full-field digital mammography (FFDM) compared with screen-film mammography (SFM). FFDM was performed using an amorphous silicon detector with a caesium iodide scintillator layer (Senographe 2000D, GE, Milwaukee, USA). SFM was performed using a state-of-the-art conventional system (Senographe DMR, GE, Milwaukee, USA) with a dedicated screen-film combination. An anthropomorphic breast phantom with superimposed microcalcifications (50-200 mum) was used to evaluate the detectability of microcalcifications. Contact mammograms and magnification views (m=1.8) performed with both the digital and the screen-film system were compared. Images were exposed automatically. Molybdenum/Molybdenum (Mo/Mo) anode-filter combination, 28 kVp and 63 mAs were selected by the automatic optimization of parameters (AOP) of the conventional system. This exposure protocol (protocol A) was also used as baseline for the digital system. Dose reduction in digital mammography was achieved by using protocol B with Mo/Rh and 31 kVp and protocol C with Rh/Rh and 32 kVp. The detectability of microcalcifications was assessed by 3 experienced readers with a confidence level ranging from 1 to 5. A receiver operating characteristic (ROC) analysis was performed. In protocol A the area under the ROC-curve (A(z)) for contact views performed by the screen-film system was 0.64 and for those performed with the FFDM system 0.68. The A(z) values were 0.74 in protocol B and 0.65 in protocol C for the digital system. For the conventional and digital magnification views A(z) values were 0.71 and 0.79, respectively. For protocol B the A(z) value was 0.81 and for protocol C it was 0.76. There is no statistically significant difference in the A(z) values for the different protocols in digital mammography and no significant difference from the screen-film system. A potential for dose reduction by using other beam qualities seems to be possible with this digital system."],["dc.identifier.doi","10.1259/bjr/67597156"],["dc.identifier.isi","000184227200009"],["dc.identifier.pmid","12857708"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45672"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0007-1285"],["dc.title","Dose reduction in full-field digital mammography: an anthropomorphic breast phantom study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","359"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Der Radiologe"],["dc.bibliographiccitation.lastpage","365"],["dc.bibliographiccitation.volume","41"],["dc.contributor.author","Grabbe, Eckhard"],["dc.contributor.author","Fischer, U."],["dc.contributor.author","Funke, M."],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Baum, F."],["dc.date.accessioned","2018-11-07T09:15:05Z"],["dc.date.available","2018-11-07T09:15:05Z"],["dc.date.issued","2001"],["dc.description.abstract","To evaluate the digital technique for screening mammography various experimental studies and clinical examinations were performed by using direct full-field digital mammography (FFDM). The findings concerning the detectability and characterization of microcalcifications and soft tissue masses as well as the radiation exposure were compared to the state-of-the-art conventional screen-film mammography (SFM). The results of these studies revealed a high performance of the digital images, which are at least equivalent to the conventional images, whereas digital spot views were significantly superior to conventional ones particually in the detection of microcalcifications. This was especially true, when the potential of post-processing was used. In addition, the sensitivity of FFDM should be increased, if computer-aided-diagnosis (CAD) is available. Furthermore, the patient radiation dose can be significantly reduced. Additional advantages are quick and easy handling, efficient data transfer and digital archiving. Thus, FFDM will become an important tool in screening mammography."],["dc.identifier.doi","10.1007/s001170051014"],["dc.identifier.isi","000168405600006"],["dc.identifier.pmid","11388057"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27590"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0033-832X"],["dc.title","Value and importance of full-field digital mammography (FFDM) for screening"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1052"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN"],["dc.bibliographiccitation.lastpage","1056"],["dc.bibliographiccitation.volume","172"],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Schorn, C."],["dc.contributor.author","Fischer, U."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:58:00Z"],["dc.date.available","2018-11-07T10:58:00Z"],["dc.date.issued","2000"],["dc.description.abstract","Objectives: The study compares contrast-detail and microcalcification detectability of a full-field digital mammography (FFDM) to a state-of-the-art conventional screen-film mammography (SFM) by using different doses in the digital system. Materials and Methods: The investigations were performed with an FFDM (Senographe 2000 D, GEMS) and an SFM system (Senographe DMR, GEMS) using a contrast-detail mammography phantom (CDMAM) and an anthropomorphic breast phantom with superimposed microcalcifications. The digital detector was exposed with standard dose of SFM and with a dose reduction of up to 75%. Contrast-detail curves and correct observation ratio (COR) were performed for the CDMAM phantom. ROC analysis with a confidence level ranging from 1 to 5 was done with the results of the anthropomorphic phantom. Results: Digital mammography with the same dose revealed at least an equivalent or even higher detectability rate than conventional mammography, COR could be increased at about 10-25%. The ROC analysis yielded better results for the FFDM system. The same lesion detectability in digital mammography as in the conventional method was reached at a dose reduction of about 25%, concerning spot views even at higher reduction. Dose reduction in the anthropomorphic phantom resulted in a linear loss of detectability. The same detectability as in conventional mammography was reached, however, by a dose reduction of about 50%. Conclusion: The results suggest that FFDM is at least equivalent to or - as far as spot views are concerned - superior to conventional SFM concerning the detectability of simulated lesions. Thus, a potential of dose reduction is suggested."],["dc.identifier.doi","10.1055/s-2000-9222"],["dc.identifier.isi","000166208200017"],["dc.identifier.pmid","11199434"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50382"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Georg Thieme Verlag Kg"],["dc.relation.issn","1438-9029"],["dc.title","Full-field digital mammography: Dose-dependent detectability of simulated breast lesions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","646"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN"],["dc.bibliographiccitation.lastpage","650"],["dc.bibliographiccitation.volume","172"],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Schorn, C."],["dc.contributor.author","Funke, M."],["dc.contributor.author","Fischer, U."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:42:57Z"],["dc.date.available","2018-11-07T10:42:57Z"],["dc.date.issued","2000"],["dc.description.abstract","Objectives: The study compares direct full-field digital mammography (FFDM) to the state-of-the-art conventional screen-film mammography (SFM) concerning the detectability of simulated microcalcifications. Materials and Methods: The investigations were performed with a FFDM system (Senographe 2000D, GEMS) and a SFM system (Senographe DMR, GEMS, Fuji UM MA film with Fuji UM MAMMO FINE screen). An anthropomorphic breast phantom with superimposed microcalcifications (50-200 mu m) was used to evaluate the detectability of microcalcifications with a confidence level ranging from 1 to 5. Contact mammograms and magnification spot views (m = 1.8) of the FFDM and SFM systems were compared. A receiver operating characteristic (ROC) analysis was performed by three well-experienced readers. Results: The ROC analysis revealed a higher performance of the digital images compared to the conventional screen-film mammograms. The area under the ROC-curve (AZ) in the digital contact mammograms was 0.68 versus 0.63 in the conventional technique. The results were not significantly different. In digital spot views, A(Z) was 0.79 versus 0.70 in the conventional spot views. Conclusions: The results suggest that FFDM is at least equivalent or - as far as spot views are concerned - may be superior to conventional SFM in the detection of microcalcifications."],["dc.identifier.isi","000088646200013"],["dc.identifier.pmid","10962993"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46926"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Georg Thieme Verlag"],["dc.relation.issn","1438-9029"],["dc.title","Full-field digital mammography: A phantom study for the detectability of simulated microcalcifications."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","696"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN"],["dc.bibliographiccitation.lastpage","699"],["dc.bibliographiccitation.volume","174"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Marten, Katharina"],["dc.contributor.author","Kehbel, S."],["dc.contributor.author","Fischer, U."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:29:41Z"],["dc.date.available","2018-11-07T10:29:41Z"],["dc.date.issued","2002"],["dc.description.abstract","Purpose: Determination of average glandular dose with a full-field digital mammography system using a flat-panel X-ray detector based on amorphous silicon technology for a large group of patients. Material and Methods: The patient group includes women who were examined in a 4-month period with the digital mammographic system Senographe 2000D. The number of women was 591 and the number of exposures was 1116; only cranio-caudal projections were considered. Various quantities, including entrance surface air kerma, tube loading, and compressed breast thickness, were determined during actual mammography. Average glandular dose was determined using conversion factors g for standard breast composition. Results: The mean average glandular dose was 1.51 mGy (0.66-4.05 mGy) for a single view. The mean compressed breast thickness was 55.7 mm. The mean age of patients was 55 years (34-81 years). Conclusion: The results demonstrate that full-field digital mammography with a flat-panel detector based on amorphous silicon needs about 25% less dose in comparison with conventional screen-film mammography."],["dc.identifier.doi","10.1055/s-2002-32221"],["dc.identifier.isi","000176339900003"],["dc.identifier.pmid","12063597"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43688"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Georg Thieme Verlag Kg"],["dc.relation.issn","1438-9029"],["dc.title","Average glandular dose with amorphous silicon full-field digital mammography - Clinical results"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","940"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN"],["dc.bibliographiccitation.lastpage","945"],["dc.bibliographiccitation.volume","172"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T08:52:26Z"],["dc.date.available","2018-11-07T08:52:26Z"],["dc.date.issued","2000"],["dc.description.abstract","Purpose: Comparison of radiation exposure between a digital amorphous silicon and a screen-film based mammography system. Evaluation of a possible potential of full-field digital mammography in order to decrease the radiation dose. Methods: The average glandular dose for phantom thicknesses from 30 to 60 mm was calculated from experimentally determined entrance surface air kerma for a digital and a conventional mammography system. The effect of reducing the detector dose and of changing the radiation quality on radiation exposure and on image quality were investigated. Results: By using the delivered settings of the automatic exposure control (AEC) devices, both mammographic systems needed nearly the same doses. Regulations and guidelines on radiation doses were complied. With the digital system, a reduction of radiation exposure of up to 40% by using a higher radiation quality and decreasing slightly the detector dose without loss of diagnostic image quality, might be possible. Conclusion: The potential of fullfield digital mammography for radiation dose reduction, as shown in the present phantom study, needs however, a careful examination under clinical conditions."],["dc.identifier.doi","10.1055/s-2000-8370"],["dc.identifier.isi","000165820600014"],["dc.identifier.pmid","11142129"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22160"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Georg Thieme Verlag Kg"],["dc.relation.issn","1438-9029"],["dc.title","Radiation exposure in full-field digital mammography with a flat-panel x-ray detector based on amorphous silicon in comparison with conventional screen-film mammography."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1027"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","European Radiology"],["dc.bibliographiccitation.lastpage","1036"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T11:03:11Z"],["dc.date.available","2018-11-07T11:03:11Z"],["dc.date.issued","2005"],["dc.description.abstract","The Breast Imaging Reporting and Data System (BI-RADS) of the American College of Radiology (ACR) is a tool created to reduce variability in the terminology used in mammographic reports. An illustration of mammographic examples from our institution interpreted according to the BI-RADS lexicon of the American College of Radiology (ACR) is presented. A literature review concerning the usefulness and limitations of the BI-RADS lexicon is given."],["dc.identifier.doi","10.1007/s00330-004-2593-9"],["dc.identifier.isi","000229296900022"],["dc.identifier.pmid","15856253"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/51560"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0938-7994"],["dc.title","Applications and literature review of the BI-RADS classification"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","265"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Der Radiologe"],["dc.bibliographiccitation.lastpage","269"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Funke, M."],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Fischer, U."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:31:04Z"],["dc.date.available","2018-11-07T10:31:04Z"],["dc.date.issued","2002"],["dc.description.abstract","The advantages of full field digital mammography are the excellent and reliable image quality and the reduction of radiation exposure. Image acquisition and display are decoupled in digital mammography allowing for optimization of both independently. Image displays are currently either hardcopy produced with a laser printer or softcopy using a computer monitor. Since the amount of data is high the hardware and software must meet specific technical specifications. The diagnostic accuracy of softcopy and hardcopy interpretation is comparable if a high resolution laser printer and a high quality workstation with high spatial and contrast resolution monitors are used. However, using film display the potential benefits of digital mammography in terms of manipulation of the data is lost. Additional diagnostic benfits might be gained by the combination of softcopy display and computer assisted diagnosis (CAD) and telemammography."],["dc.identifier.doi","10.1007/s00117-002-0729-y"],["dc.identifier.isi","000175618200004"],["dc.identifier.pmid","12063733"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44010"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0033-832X"],["dc.title","Softcopy versus hardcopy interpretation in digital mammography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","341"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Journal of Digital Imaging"],["dc.bibliographiccitation.lastpage","344"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Obenauer, Silvia"],["dc.contributor.author","Hermann, K.-P."],["dc.contributor.author","Marten, Katharina"],["dc.contributor.author","Luftner-Nagel, S."],["dc.contributor.author","von Heyden, D."],["dc.contributor.author","Skaane, P."],["dc.contributor.author","Grabbe, Eckhard"],["dc.date.accessioned","2018-11-07T10:34:25Z"],["dc.date.available","2018-11-07T10:34:25Z"],["dc.date.issued","2003"],["dc.description.abstract","The objective of this study was to compare soft copy reading at a mammography work station with hard copy reading of full-field digital mammographic images. Mammograms of 60 patients (n = 29 malignant, n = 31 benign) performed with full-field digital mammography (Senographe 2000D, GE, Buc, France) were evaluated. Reading was performed based on hard copy prints (Scopix, Agfa, Leverkusen, Germany) and on 2 k x 2.5 k high-resolution monitors (Sun Ultra 60, Sun Microsystems, Palo Alto, California, USA). Four readers with different levels of experience in mammography categorized the mammograms according to the Bl-RADS classification. The comparative study was performed by four readers, and at least 2 months elapsed between the reading sessions. Postprocessing, of course, was available only at the work station (windowing and leveling, zooming, inversion). Sensitivity, specificity, and positive predictive value were evaluated. Diagnostic accuracy of the evaluation was determined. Sensitivity for malignant lesions in hard copy versus soft copy reading was 97% vs 90%,97% vs 97%,93% vs 97%, and 76% vs 76% for the four readers, respectively. Specificity was 52% vs 68%, 58% vs 74%, 65% vs 48%, and 61% vs 68%. Accuracy for the classification of malignant lesions according to the Bl-RADS categories showed no difference between hard copy and soft copy reading. Soft copy reading is possible with the available system and enables radiologists to use the advantages of a digital system."],["dc.identifier.doi","10.1007/s10278-003-1661-z"],["dc.identifier.isi","000220189300005"],["dc.identifier.pmid","14749966"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44870"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0897-1889"],["dc.title","Soft copy versus hard copy reading in digital mammography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]