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Andersson, Torbjörn
Publications (10 of 14) Show all publications
Lundin, M., Lidén, M., Magnusson, A., Abdulilah Mohammed, A., Geijer, H., Andersson, T. & Persson, A. (2012). Virtual non-contrast dual-energy CT compared to single-energy CT of the urinary tract: a prospective study. Acta Radiologica, 53(6), 689-694
Open this publication in new window or tab >>Virtual non-contrast dual-energy CT compared to single-energy CT of the urinary tract: a prospective study
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2012 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 53, no 6, p. 689-694Article in journal (Refereed) Published
Abstract [en]

Background: Dual-energy computed tomography (DECT) has been shown to be useful for subtracting bone or calcium in CT angiography and gives an opportunity to produce a virtual non-contrast-enhanced (VNC) image from a series where contrast agents have been given intravenously. High noise levels and low resolution have previously limited the diagnostic value of the VNC images created with the first generation of DECT. With the recent introduction of a second generation of DECT, there is a possibility of obtaining VNC images with better image quality at hopefully lower radiation dose compared to the previous generation.

Purpose: The aim of this study is to compare the image quality of the single-energy series to a VNC series obtained with a two generations of DECT scanners. CT of the urinary tract was used as a model.

Material and Methods: Thirty patients referred for evaluation of haematuria were examined with an older system (Somatom Definition) and another 30 patients with a new generation (Somatom Definition Flash). One single-energy series was obtained before and one dual-energy series after administration of intravenous contrast media. We created a VNC series from the contrast-enhanced images. Images were assessed concerning image quality with a visual grading scale evaluation of the VNC series with the single-energy series as gold standard.

Results: The image quality of the VNC images was rated inferior to the single-energy variant for both scanners, OR range 11.5-67.3 for the Definition and OR 2.1-2.8 for the Definition Flash. Visual noise and overall quality were regarded as better with Flash than Definition.

Conclusions: Image quality of VNC images obtained with the new generation of DECT is still slightly inferior compared to native images. However the difference is smaller with the new compared to the older system.

Place, publisher, year, edition, pages
Informa Healthcare, 2012
Keywords
Dual-energy computed tomography, image quality, urinary tract imaging, virtual non-enhanced image series, bone-iodine differentiation
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-76721 (URN)10.1258/ar.2012.110661 (DOI)000306984000017 ()
Available from: 2012-04-18 Created: 2012-04-18 Last updated: 2017-12-07Bibliographically approved
Jansson, M., Geijer, H. & Andersson, T. (2007). Bowel preparation for excretory urography is not necessary: a randomized trial. British Journal of Radiology, 80(956), 617-624
Open this publication in new window or tab >>Bowel preparation for excretory urography is not necessary: a randomized trial
2007 (English)In: British Journal of Radiology, ISSN 0007-1285, E-ISSN 1748-880X, Vol. 80, no 956, p. 617-624Article in journal (Refereed) Published
Abstract [en]

Despite the fact that computed tomography is becoming more commonly used to investigate the genitourinary tract, intravenous urography still plays an important role in uroradiology. The aim of this study was to compare bowel purgation and two other preparation methods — dietary restrictions and no preparations at all — in an attempt to find the optimal procedure for uniform practice. 210 consecutive patients were randomised to three preparation groups with 70 in each group. Group 1 received standard bowel purgation, Group 2 was instructed to fast, while Group 3 had no preparation at all. Irrespective of preparation, all patients underwent the same examination procedure. The examining radiographer and evaluating radiologists were unaware of the type of preparation given. Image quality was assessed according to European Commission criteria for excretory urography. The effectiveness of bowel purgation and the amount of residual gas were scored separately. There was no statistically significant difference in the proportions with fulfilled criteria between preparation Groups 1 and 2 and Groups 1 and 3. A criterion was regarded as fulfilled only when all three observers agreed. Assessment of the amount of residual faeces proved the effectiveness of our standard bowel purgation. The results of our study show equality of the evaluated preparation methods and cannot justify further use of bowel purgation before excretory urography.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-76719 (URN)10.1259/bjr/78311002 (DOI)000249951000005 ()
Available from: 2012-04-18 Created: 2012-04-18 Last updated: 2017-12-07Bibliographically approved
Kähäri, A., Thunberg, P., Emilsson, K., Geijer, H., Andersson, T. & Wandt, B. (2003). Assessment of left ventricular function from M‐mode measurement of circumflex artery motion recorded by coronary angiography. Scandinavian Cardiovascular Journal, 37(5), 259-265
Open this publication in new window or tab >>Assessment of left ventricular function from M‐mode measurement of circumflex artery motion recorded by coronary angiography
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2003 (English)In: Scandinavian Cardiovascular Journal, ISSN 1401-7431, E-ISSN 1651-2006, Vol. 37, no 5, p. 259-265Article in journal (Refereed) Published
Abstract [en]

Objective—To evaluate the usefulness of M‐mode measurement of circumflex artery motion (CAM) for assessment of left ventricular (LV) function.

Design—Seventy‐two patients referred for coronary angiography and LV angiography were included. Ejection fraction (EF) was calculated from LV angiography and systolic and diastolic parameters of CAM were measured by M‐mode from coronary angiography. Twenty‐three patients, examined by echocardiography of mitral annulus motion (MAM) within 24 h before the angiographic examination, formed a subgroup for comparison between angiographic M‐mode of CAM and echocardiographic M‐mode of MAM.

Results—In addition to previous reported CAM amplitude and longitudinal fractional shortening (FS L ) the maximal systolic velocity of CAM can be reliably recorded by M‐mode. The diastolic indices, atrial contribution to the total amplitude and maximal early and late diastolic velocities, are also well monitored by M‐mode of CAM in comparison with echocardiographic MAM.

Conclusion—LV systolic and diastolic function can be assessed by M‐mode of CAM.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-26782 (URN)10.1080/14017430310001708 (DOI)11387 (Local ID)11387 (Archive number)11387 (OAI)
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2017-12-13Bibliographically approved
Kähäri, A., Emilsson, K., Danielewicz, M., Andersson, T. & Wandt, B. (2003). Circumflex artery motion: a new angiographic method for assessment of left ventricular function. Scandinavian Cardiovascular Journal, 37(2), 80-86
Open this publication in new window or tab >>Circumflex artery motion: a new angiographic method for assessment of left ventricular function
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2003 (English)In: Scandinavian Cardiovascular Journal, ISSN 1401-7431, E-ISSN 1651-2006, Vol. 37, no 2, p. 80-86Article in journal (Refereed) Published
Abstract [en]

OBJECTIVE: To evaluate the usefulness of circumflex artery motion (CAM) for assessment of left ventricular (LV) function.

DESIGN: Seventy-three consecutive patients referred for coronary angiography and LV angiography were included. Ejection fraction (EF) was calculated from LV angiography and CAM was measured from coronary angiography.

RESULTS: The ratio between CAM and the end-diastolic length of the ventricle, which can be denominated long-axis fractional shortening (FS(L)), was found to be a better index of LV function than CAM per se. There was a significant linear correlation between EF and FS(L) (r = 0.81, SEE = 8.2, p < 0.001). When values of FS(L) > or =10% were selected to define a normal EF (> or =50%) there was a sensitivity of 95% and a specificity of 93%. Visual estimation of EF from CAM was not as good as the use of calculated FS(L) but may me useful as a fast screening method.

CONCLUSION: LV systolic function can be assessed by studying CAM recorded by coronary angiography.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-26781 (URN)12775306 (PubMedID)11386 (Local ID)11386 (Archive number)11386 (OAI)
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2017-12-13Bibliographically approved
Geijer, H., Verdonck, B., Beckman, K.-W., Andersson, T. & Persliden, J. (2003). Digital Radiography of Scoliosis with a Scanning Method: Radiation Dose Optimization. European Radiology, 13(3), 543-551
Open this publication in new window or tab >>Digital Radiography of Scoliosis with a Scanning Method: Radiation Dose Optimization
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2003 (English)In: European Radiology, ISSN 0938-7994, E-ISSN 1432-1084, Vol. 13, no 3, p. 543-551Article in journal (Refereed) Published
Abstract [en]

The aim of this study was optimization of the radiation dose–image quality relationship for a digital scanning method of scoliosis radiography. The examination is performed as a digital multi-image translation scan that is reconstructed to a single image in a workstation. Entrance dose was recorded with thermoluminescent dosimeters placed dorsally on an Alderson phantom. At the same time, kerma area product (KAP) values were recorded. A Monte Carlo calculation of effective dose was also made. Image quality was evaluated with a contrast-detail phantom and Visual Grading. The radiation dose was reduced by lowering the image intensifier entrance dose request, adjusting pulse frequency and scan speed, and by raising tube voltage. The calculated effective dose was reduced from 0.15 to 0.05 mSv with reduction of KAP from 1.07 to 0.25 Gy cm2 and entrance dose from 0.90 to 0.21 mGy. The image quality was reduced with the Image Quality Figure going from 52 to 62 and a corresponding reduction in image quality as assessed with Visual Grading. The optimization resulted in a dose reduction to 31% of the original effective dose with an acceptable reduction in image quality considering the intended use of the images for angle measurements.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-26783 (URN)10.1007/s00330-002-1476-1 (DOI)11388 (Local ID)11388 (Archive number)11388 (OAI)
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2017-12-13Bibliographically approved
Kähäri, A., Andersson, T., Danielewicz, M., Emilsson, K. & Wandt, B. (2002). Circumflexrörelsen: en ny angiografisk metod för bedömning av vänsterkammarfunktionen. In: Svenska Läkaresällskapets Handlingar,2002 (pp. 228-228).
Open this publication in new window or tab >>Circumflexrörelsen: en ny angiografisk metod för bedömning av vänsterkammarfunktionen
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2002 (Swedish)In: Svenska Läkaresällskapets Handlingar,2002, 2002, p. 228-228Conference paper, Published paper (Refereed)
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-27342 (URN)11994 (Local ID)11994 (Archive number)11994 (OAI)
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2012-09-04Bibliographically approved
Persliden, J., Beckman, K.-W., Geijer, H. & Andersson, T. (2002). Dose-image optimisation in digital radiology with a direct digital detector: an example applied to pelvic examination. European Radiology, 12, 1584-1588
Open this publication in new window or tab >>Dose-image optimisation in digital radiology with a direct digital detector: an example applied to pelvic examination
2002 (English)In: European Radiology, ISSN 0938-7994, E-ISSN 1432-1084, Vol. 12, p. 1584-1588Article in journal (Refereed) Published
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-26780 (URN)11385 (Local ID)11385 (Archive number)11385 (OAI)
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2017-12-13
Andersson, T. & Pucar, P. (1995). Estimation of Residence Time in Continuous Flow Systems with Dynamics. Journal of Process Control, 5(1), 9-17
Open this publication in new window or tab >>Estimation of Residence Time in Continuous Flow Systems with Dynamics
1995 (English)In: Journal of Process Control, ISSN 0959-1524, E-ISSN 1873-2771, Vol. 5, no 1, p. 9-17Article in journal (Refereed) Published
Abstract [en]

A method for estimation of residence time in continuous flow systems with varying dynamics is presented. By resampling, i.e., choosing time instants different from the given sampling instants, and interpolation between measured data points, we obtain a continuous flow system with constant residence time expressed in the new resampled time vector. We assume the flow patterns in the systems are invariant. The new data set is then used for identification of parameters in a chosen model structure. From the identified model, the residence time is readily calculated and a procedure for that is briefly described. The presented method is readily extended to enable use in recursive identification. In that case, however, as an improvement of tracking ability of an ordinary recursive routine. Keywords : System identification, residence time estimation, time-varying systems, variable flow and/or volume, continuous flow systems, recursive identification.

Keywords
System identification, Residence time estimation, Time-varying systems
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-56341 (URN)10.1016/0959-1524(95)95941-6 (DOI)
Available from: 2010-05-09 Created: 2010-05-07 Last updated: 2017-12-12
Andersson, T., Pucar, P. & Ljung, L. (1994). Identification Aspects of Inter-Sampling Behavior. Linköping: Linköping University
Open this publication in new window or tab >>Identification Aspects of Inter-Sampling Behavior
1994 (English)Report (Other academic)
Abstract [en]

In this contribution aspects of inter-sample input signal behavior are examined. The starting point is that parametric identication always is performed on basis of discrete-time data. This is valid for identication of discrete-time models as well as continuous-time models. The usual assumptions on the input signal are; i) it is band-limited, ii) it is piecewise constant or iii) it is piecewise linear. One point made in this paper is that if a discrete-time model is used, the best possible (in the model structure) adjustment to data is made. This is independent of the assumption on the input signal. However, a transformation of the obtained discrete model to a continuous one is not possible without additional assumptions on the input signal. The other point made is that the frequency functions of the discrete models very well coincides with the frequency functions of the discretized continuous time models and the continuous time transfer function fitted in the frequency domain.

Place, publisher, year, edition, pages
Linköping: Linköping University, 1994. p. 6
Series
LiTH-ISY-R, ISSN 1400-3902 ; 1606
Keywords
System identification, Discrete time systems Frequency domain, Inter-sample assumptions
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-55179 (URN)LiTH-ISY-R-1606 (ISRN)
Available from: 2010-04-29 Created: 2010-04-29 Last updated: 2014-10-09Bibliographically approved
Andersson, T. & Pucar, P. (1993). Estimation of Residence Time in Continuous Flow Systems with Varying Flow and Volume. Linköping: Linköping University
Open this publication in new window or tab >>Estimation of Residence Time in Continuous Flow Systems with Varying Flow and Volume
1993 (English)Report (Other academic)
Abstract [en]

A method for estimation of residence time in continuous flow vessels with variable flow and volume is presented. By resampling, i.e., choosing time instants different from the given sampling instants, and interpolation of measured data points, we obtain a continuous flow system with constant residence time expressed in the new resampled time vector, assuming the flow patterns in the vessels and tanks are invariant. The new data set is then used for identification of parameters in a chosen model structure. From the identified model the residence time is easily calculated and a procedure for that is briefly described. The presented method is easily extended to enable use in recursive identification but then as an improvement of tracking ability of an ordinary recursive routine.

Place, publisher, year, edition, pages
Linköping: Linköping University, 1993. p. 9
Series
LiTH-ISY-R, ISSN 1400-3902 ; 1460:93
Keywords
System identification, Residence time estimation, Time-varying systems, Variable flow and/or volume, Continuous flow systems, Recursive identification
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-55587 (URN)LiTH-ISY-R-1460:93 (ISRN)
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-08-01Bibliographically approved
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