1
|
Ferstl S, Busse M, Muller M, Kimm MA, Drecoll E, Burkner T, Allner S, Dierolf M, Pfeiffer D, Rummeny EJ, Weichert W, Pfeiffer F. Revealing the Microscopic Structure of Human Renal Cell Carcinoma in Three Dimensions. IEEE Trans Med Imaging 2020; 39:1494-1500. [PMID: 31714220 DOI: 10.1109/tmi.2019.2952028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
For fully characterizing renal cell carcinoma (RCC), information about the 3D tissue microstructure is essential. Histopathology, which represents the current diagnostic gold standard, is destructive and only provides 2D information. 3D X-ray histology endeavors to overcome these limitations by generating 3D data. In a laboratory environment, most techniques struggle with limited resolution and the weak X-ray attenuation contrast of soft tissue. We recently developed a laboratory-based method combining nanoscopic X-ray CT with a cytoplasm-specific X-ray stain. Here, we present the application of this method to human RCC biopsies. The NanoCT slices enable pathological characterization of crucial structures by reproducing tissue morphology with a similar detail level as corresponding histological light microscopy images. Beyond that, our data offer deeper insights into the 3D configuration of the tumor. By demonstrating the compatibility of the X-ray stain with standard pathological stains, we highlight the feasibility of integrating staining based NanoCT into the pathological routine.
Collapse
|
2
|
Burian E, Subburaj K, Mookiah MRK, Rohrmeier A, Hedderich DM, Dieckmeyer M, Diefenbach MN, Ruschke S, Rummeny EJ, Zimmer C, Kirschke JS, Karampinos DC, Baum T. Texture analysis of vertebral bone marrow using chemical shift encoding-based water-fat MRI: a feasibility study. Osteoporos Int 2019; 30:1265-1274. [PMID: 30903208 PMCID: PMC6546652 DOI: 10.1007/s00198-019-04924-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 02/18/2019] [Indexed: 12/20/2022]
Abstract
UNLABELLED This feasibility study investigated the spatial heterogeneity of the lumbar vertebral bone marrow using chemical shift encoding-based water-fat MRI. Acquired texture features like contrast and dissimilarity allowed for differentiation of pre- and postmenopausal women and may serve as imaging biomarkers in the future. INTRODUCTION While the vertebral bone marrow fat using chemical shift encoding water-fat magnetic resonance imaging (MRI) has been extensively studied, its spatial heterogeneity has not been analyzed yet. Therefore, this feasibility study investigated the spatial heterogeneity of the lumbar vertebral bone marrow by using texture analysis in proton density fat fraction (PDFF) maps. METHODS Forty-one healthy pre- and postmenopausal women were recruited for this study (premenopausal (n = 15) 30 ± 7 years, postmenopausal (n = 26) 65 ± 7 years). An eight-echo 3D spoiled gradient echo sequence was used for chemical shift encoding-based water-fat separation at the lumbar spine. Vertebral bodies L1 to L5 were manually segmented. Mean PDFF values and texture features were extracted at each vertebral level, namely variance, skewness, and kurtosis, using statistical moments and second-order features (energy, contrast, correlation, homogeneity, dissimilarity, entropy, variance, and sum average). Parameters were compared between pre- and postmenopausal women and vertebral levels. RESULTS PDFF was significantly higher in post- than in premenopausal women (49.37 ± 8.14% versus 27.76 ± 7.30%, p < 0.05). Furthermore, PDFF increased from L1 to L5 (L1 37.93 ± 12.85%, L2 38.81 ± 12.77%, L3 40.23 ± 12.72%, L4 42.80 ± 13.27%, L5 45.21 ± 14.55%, p < 0.05). Bone marrow heterogeneity based on texture analysis was significantly (p < 0.05) increased in postmenopausal women. Contrast and dissimilarity performed best in differentiating pre- and postmenopausal women (AUC = 0.97 and 0.96, respectively), not significantly different compared with PDFF (AUC = 0.97). CONCLUSION Conclusively, an increased bone marrow heterogeneity could be observed in postmenopausal women. In the future, texture parameters might provide additional information to detect and monitor vertebral bone marrow alterations due to aging or hormonal changes beyond conventional anatomic imaging.
Collapse
Affiliation(s)
- E. Burian
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - K. Subburaj
- 0000 0004 0500 7631grid.263662.5Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372 Singapore
| | - M. R. K. Mookiah
- 0000 0004 0500 7631grid.263662.5Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372 Singapore
| | - A. Rohrmeier
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - D. M. Hedderich
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - M. Dieckmeyer
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - M. N. Diefenbach
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - S. Ruschke
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - E. J. Rummeny
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - C. Zimmer
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - J. S. Kirschke
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - D. C. Karampinos
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - T. Baum
- 0000000123222966grid.6936.aDepartment of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| |
Collapse
|
3
|
Einspieler I, Henninger M, Mergen V, Wendorff H, Haller B, Eiber M, Rummeny EJ, Schwaiger M, Moog P, Thürmel K. Three-dimensional fat-saturated T1-weighted Cartesian volumetric interpolated breath-hold examination (VIBE) for the diagnosis of aortitis in patients with suspected large vessel vasculitis: a comparative study with 18F-FDG PET applying fully integrated PET/MRI. Clin Radiol 2019; 74:731.e11-731.e19. [PMID: 31130228 DOI: 10.1016/j.crad.2019.04.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/11/2019] [Indexed: 12/27/2022]
Abstract
AIM To evaluate the feasibility of T1-weighted (T1W) three-dimensional (3D) fat saturated Cartesian volumetric interpolated breath-hold examination (VIBE) magnetic resonance imaging (MRI) sequence for the diagnosis of aortitis in patients with suspected large vessel vasculitis (LVV) applying fully integrated 2-[18F]-fluoro-2-deoxy-d-glucose (18F-FDG) positron-emission tomography (PET)/MRI. MATERIAL AND METHODS Fourteen patients with aortitis and 14 patients with a negative study for aortitis using 18F-FDG PET as the standard of reference for the evaluation of inflammatory aortic involvement were included retrospectively. All patients were imaged at 3 T using T1W VIBE pre- and post-contrast. Four aortic segments were evaluated for image quality (IQ), diagnostic confidence (DC), and the degree of inflammatory activity (IA) using a Likert scale. Binomial and generalised estimating equation model tests were used to assess the diagnostic performance of T1W VIBE. Cohen's k was applied to test for interobserver reproducibility with respect to IA. Spearman's rank correlation coefficient was calculated to examine correlations between IQ, DC, IA, and PET results. RESULTS On a patient- and segment-based analysis, sensitivity, specificity, positive predictive value, negative predictive value, and accuracy were 85.7% and 59.8%, 100% and 100%, 100% and 100%, 87.5% and 68%, and 92.9% and 82.1%, respectively. IQ and DC were acceptable to good in all examinations and substantial interobserver agreement was observed for IA (Cohen's k = 0.69). IQ and DC as well as IA and 18F-FDG vessel wall uptake were significantly correlated (r=0.763 and 0.679, respectively; p<0.0001). CONCLUSION T1W 3D fat saturated VIBE MRI allows diagnosis of aortitis and may aid in the management of patients with suspected LVV.
Collapse
Affiliation(s)
- I Einspieler
- Department of Nuclear Medicine, Technische Universität München, Klinikum rechts der Isar, Munich, Germany; Department of Radiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany; Department of Radiology, University Hospital Regensburg, Regensburg, Germany.
| | - M Henninger
- Department of Nuclear Medicine, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - V Mergen
- Department of Nuclear Medicine, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - H Wendorff
- Department of Vascular Surgery, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - B Haller
- Department of Medical Statistics and Epidemiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - M Eiber
- Department of Nuclear Medicine, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - E J Rummeny
- Department of Radiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - M Schwaiger
- Department of Nuclear Medicine, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - P Moog
- Department of Nephrology and Rheumatology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - K Thürmel
- Department of Nephrology and Rheumatology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| |
Collapse
|
4
|
Gersing AS, Feuerriegel G, Holwein C, Suchowierski J, Karampinos DC, Haller B, Baum T, Schwaiger BJ, Kirschke JS, Rummeny EJ, Imhoff AB, Woertler K, Jungmann PM. T2-relaxation time of cartilage repair tissue is associated with bone remodeling after spongiosa-augmented matrix-associated autologous chondrocyte implantation. Osteoarthritis Cartilage 2019; 27:90-98. [PMID: 30248504 DOI: 10.1016/j.joca.2018.08.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 08/02/2018] [Accepted: 08/30/2018] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate whether T2 relaxation time measurements of cartilage repair tissue and structural changes of the knee joint are associated with subchondral bone architecture after spongiosa-augmented matrix-associated autologous chondrocyte implantation (MACI). DESIGN Both knees of 25 patients (25.5 ± 7.8y; 10 women) were examined preoperatively and 2.7 years after unilateral spongiosa-augmented MACI with 3T magnetic resonance (MR) imaging. Cartilage composition was assessed using T2 relaxation time measurements, subchondral trabecular bone microstructure was quantified using a 3D phase-cycled balanced steady state free-precision sequence. Structural knee joint changes were assessed using the modified Whole-Organ Magnetic Resonance Imaging Score (WORMS). The Magnetic Resonance Observation of Cartilage Repair Tissue (MOCART) score was used for the postoperative description of the area that underwent MACI. Correlations were assessed using Spearman's rank correlation coefficients. RESULTS Hypertrophy of the cartilage repair tissue was found in 2 of 25 patients, both after a MACI procedure at the patella, 21 patients showed congruent filling. In subchondral bone of the cartilage repair compartment, apparent trabecular thickness was significantly higher in compartments with elevated cartilage T2 (n = 17; 0.37 ± 0.05 mm) compared to those showing no difference in cartilage T2 compared to the same compartment in the contralateral knee (n = 8; 0.27 ± 0.05 mm; P = 0.042). Significant correlations were found between the overall progression of WORMS and the ipsilateral vs contralateral ratio of average trabecular thickness (r = 0.48, P = 0.031) and bone fraction (r = 0.57, P = 0.007). CONCLUSIONS After spongiosa-augmented MACI, T2 values of cartilage repair tissue and structural knee joint changes correlated with the quality of the underlying trabecular bone.
Collapse
Affiliation(s)
- A S Gersing
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - G Feuerriegel
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - C Holwein
- Department of Orthopaedic Sports Medicine, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany; Department of Trauma and Orthopaedic Surgery, BG Unfallklinik Murnau, Murnau, Germany.
| | - J Suchowierski
- Department of Orthopaedic Sports Medicine, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - D C Karampinos
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - B Haller
- Institute of Medical Informatics, Statistics and Epidemiology, Technical University of Munich, Munich, Germany.
| | - T Baum
- Department of Neuroradiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - B J Schwaiger
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - J S Kirschke
- Department of Neuroradiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - E J Rummeny
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - A B Imhoff
- Department of Orthopaedic Sports Medicine, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - K Woertler
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.
| | - P M Jungmann
- Department of Radiology, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany; Department of Neuroradiology, University Hospital Zurich, University of Zurich, Switzerland.
| |
Collapse
|
5
|
Knoll A, Mewes HW, Schwaiger M, Bode A, Broy M, Daniel H, Feussner H, Gradinger R, Hauner H, Höfler H, Holzmann B, Horsch A, Kemper A, Krcmar H, Kochs EF, Lange R, Leidl R, Mansmann U, Mayr EW, Meitinger T, Molls M, Navab N, Nüsslin F, Peschel C, Reiser M, Ring J, Rummeny EJ, Schlichter J, Schmid R, Wichmann HE, Ziegler S, Kuhn KA. Informatics and Medicine. Methods Inf Med 2018. [DOI: 10.3414/me9117] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Summary
Objectives: To clarify challenges and research topics for informatics in health and to describe new approaches for interdisciplinary collaboration and education. Methods: Research challenges and possible solutions were elaborated by scientists of two universities using an interdisciplinary approach, in a series of meetings over several months. Results and Conclusion: In order to translate scientific results from bench to bedside and further into an evidence-based and efficient health system, intensive collaboration is needed between experts from medicine, biology, informatics, engineering, public health, as well as social and economic sciences. Research challenges can be attributed to four areas: bioinformatics and systems biology, biomedical engineering and informatics, health informatics and individual healthcare, and public health informatics. In order to bridge existing gaps between different disciplines and cultures, we suggest focusing on interdisciplinary education, taking an integrative approach and starting interdisciplinary practice at early stages of education.* See more detailed authors´ affiliations at the end of the article.
Collapse
|
6
|
Franz D, Weidlich D, Freitag F, Holzapfel C, Drabsch T, Baum T, Eggers H, Witte A, Rummeny EJ, Hauner H, Karampinos DC. Association of proton density fat fraction in adipose tissue with imaging-based and anthropometric obesity markers in adults. Int J Obes (Lond) 2017; 42:175-182. [PMID: 28894290 PMCID: PMC5737837 DOI: 10.1038/ijo.2017.194] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 06/30/2017] [Accepted: 08/02/2017] [Indexed: 12/31/2022]
Abstract
Background/Objectives: The purpose of this study was to examine the relationship of the proton density fat fraction (PDFF), measured by magnetic resonance imaging (MRI), of supraclavicular and gluteal adipose tissue with subcutaneous and visceral adipose tissue (SAT and VAT) volumes, liver fat fraction and anthropometric obesity markers. The supraclavicular fossa was selected as a typical location where brown adipocytes may be present in humans and the gluteal region was selected as a typical location enclosing primarily white adipocytes. Subjects/Methods: In this cross-sectional study, 61 adults (44 women, median age 29.3 years, range 21–68 years) underwent an MRI examination of the neck and the abdomen/pelvis (3T, Ingenia, Philips Healthcare). PDFF maps of the supraclavicular and gluteal adipose tissue and the liver were generated. Volumes of SAT and VAT were calculated and supraclavicular and subcutaneous fat were segmented using custom-built post-processing algorithms. Body mass index (BMI), waist circumference and waist-to-height ratio were recorded. Statistical analysis was conducted using the Student's t-test and Pearson correlation analysis. Results: Mean supraclavicular PDFF was 75.3±4.7% (range 65.4–83.8%) and mean gluteal PDFF was 89.7±2.9% (range 82.2-94%), resulting in a significant difference (P<0.0001). Supraclavicular PDFF was positively correlated with VAT (r=0.76, P<0.0001), SAT (r=0.73, P<0.0001), liver PDFF (r=0.42, P=0.0008) and all measured anthropometric obesity markers. Gluteal subcutaneous PDFF also correlated with VAT (r=0.59, P<0.0001), SAT (r=0.63, P<0.0001), liver PDFF (r=0.3, P=0.02) and anthropometric obesity markers. Conclusions: The positive correlations between adipose tissue PDFF and imaging, as well as anthropometric obesity markers suggest that adipose tissue PDFF may be useful as a biomarker for improving the characterization of the obese phenotype, for risk stratification and for selection of appropriate treatment strategies.
Collapse
Affiliation(s)
- D Franz
- Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - D Weidlich
- Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - F Freitag
- Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - C Holzapfel
- Institute for Nutritional Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - T Drabsch
- Institute for Nutritional Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - T Baum
- Department of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - H Eggers
- Philips Research Laboratory, Hamburg, Germany
| | - A Witte
- FOM University of Applied Sciences, Essen, Germany
| | - E J Rummeny
- Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - H Hauner
- Institute for Nutritional Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - D C Karampinos
- Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| |
Collapse
|
7
|
|
8
|
Abstract
Primary hepatocellular carcinoma and liver metastases affect several millon people each year. The main imaging modalities to detect and assist diagnosis of primary and secondary liver tumours include MR imaging, CT, and US. The value of these techniques is further increased by the use of contrast agents which increase the sensitivity, and sometimes also the specificity, of the investigations. The relative advantages and drawbacks of the different contrast agents and imaging modalities in the detection and characterisation of liver tumours are discussed. Currently there is no consensus amongst investigators as to which is superior, due to the technical complexities and number of combinations possible within each of the different modalities. There continues to be advances in the hardware and software of imaging equipment, as well as a trend to develop new contrast agents with more organ-specificity. These include those targeting the hepatocytes, such as mangafodipir trisodium (MnDPDP, Teslascan), and those with reticuloendothelial cell specificity, such as the superpara-magnetic iron oxides. These developments have the potential for making significant contributions to the diagnostic value of imaging procedures and, by reducing the number of investigations necessary to reach a final diagnosis, having a significant and beneficial impact on the pharmaco-economics of patient health care.
Collapse
Affiliation(s)
- E J Rummeny
- Department of Clinical Radiology, Westfalian Wilbelms-University, Münster, Germany.
| | | |
Collapse
|
9
|
Abstract
Purpose: To evaluate the diagnostic efficacy of mangafodipir trisodium (MnDPDP, Teslascan) as a new contrast agent for MR imaging of the liver based on an independent evaluation of the MR images from the European phase III studies. Material and Methods: MR imaging of the liver was done at 0.5–2.0 T in 17 European centres and included T1-weighted spin-echo and gradient-echo sequences before and after administration of MnDPDP to patients at a dose of 5 μmol/kg b.w. T2-weighted images were also obtained in all cases before the i.v. injection of the agent. Images of a total of 592 patients were evaluated by 4 independent experienced radiologists who were not involved in the on-site clinical trials. Results: Statistically significantly more lesions were detected (p = 0.0014) in MnDP-DP-enhanced T1-weighted MR images than in unenhanced images. T1-weighted gradient-echo sequences were found to be superior to T1-weighted spin-echo sequences after injection of MnDPDP. The post-contrast images were found to be statistically significantly superior to the pre-contrast images in confidence in the presence of a lesion ( p≤ 0.0001), quality of lesion delineation ( p≤ 0.0001), lesion conspicuity ( p ≤ 0.0001) and in the confidence in the diagnosis of a lesion (p = 0.001). Conclusion: This independent evaluation of the European phase III trials confirmed the superiority of MnDPDP-enhanced MR images over unenhanced images for lesion detection and characterization.
Collapse
Affiliation(s)
- E J Rummeny
- Department of Clinical Radiology, University of Münster, Germany.
| | | | | | | | | | | |
Collapse
|
10
|
Maegerlein C, Rummeny EJ, Gaa J. [Massive lower gastrointestinal hemorrhage after polypectomy due to a colon fistula of a pseudoaneurysm of the splenic artery caused by chronic pancreatitis]. Z Gastroenterol 2015; 53:664-7. [PMID: 26167697 DOI: 10.1055/s-0034-1399722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A life-threatening lower gastrointestinal bleeding is a rare complication due to coloscopic polypectomy. The following case report deals with a severe bleeding that was caused by polypectomy of a villous adenoma in a patient with chronic pancreatitis causing a huge pseudoaneurysm of the splenic artery. After polypectomy a wide iatrogenic communication between the pseudoaneurysm and the colon existed causing massive arterial intraluminal bleeding. Although this was successfully managed by transcatheter arterial embolization via splenic artery, the patient died a few days later caused by disseminated intravasal anticoagulation and multi organ failure.
Collapse
|
11
|
Stimmer H, Niedermeyer HP, Kehl V, Rummeny EJ. Nontumorous Enlargement of the Internal Auditory Canal: A Risk Factor for Sensorineural Hearing Loss? A High Resolution CT-Study. ROFO-FORTSCHR RONTG 2015; 187:450-8. [PMID: 25905691 DOI: 10.1055/s-0034-1399009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE First aim of the study was to define normal shape and diameter of the internal auditory canal (IAC). In the second part the clinical relevance of IAC-enlargement was analyzed, considering also lesions of the subtle structures at the fundus of the internal auditory canal. MATERIALS AND METHODS 440 high resolution CT-scans of the temporal bone were used for retrospective analysis of the internal auditory canal and its fundus region. RESULTS The mean value of the IAC diameter in axial and coronal plane was determined. In 20 of 440 patients IAC enlargement was found. In the group with pronounced enlargement (3fold SD) nearly all patients suffered from hearing impairment. In some of them we found structural abnormalities near the IAC fundus in the CSF/perilymph border zone. CONCLUSION A new CT-based definition of normal shape and diameter of the internal auditory canal is presented. There is some evidence that a pathologic transmission of CSF-pressure in case of IAC-enlargement and/or abnormal fistulous communications could play an important role in the pathophysilogy of hearing loss. KEY POINTS • New CT-based definition of normal internal auditory canal.• Nearly all patients showing pronounced IAC-enlargement suffer from hearing impairment.• Possible pathomechanism: Transmission of CSF-pressure on the inner ear.
Collapse
Affiliation(s)
- H Stimmer
- Department of Radiology, Klinikum rechts der Isar Technical University Munich, Germany
| | - H P Niedermeyer
- ENT-Clinic, Klinikum rechts der Isar, Technical University Munich, 81675 Munich, Germany
| | - V Kehl
- Institute for medical Statistics and Epidemiology, Klinikum rechts der Isar, Technical University Munich, 81675 Munich, Germany
| | - E J Rummeny
- Department of Radiology, Klinikum rechts der Isar, Technical University Munich, 81675 Munich, Germany
| |
Collapse
|
12
|
Beziere N, von Schacky C, Kosanke Y, Kimm M, Nunes A, Licha K, Aichler M, Walch A, Rummeny EJ, Ntziachristos V, Meier R. Optoacoustic Imaging and Staging of Inflammation in a Murine Model of Arthritis. Arthritis Rheumatol 2014; 66:2071-8. [DOI: 10.1002/art.38642] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 03/20/2014] [Indexed: 11/09/2022]
Affiliation(s)
- N. Beziere
- Technische Universität München, Munich, Germany, and Helmholtz Zentrum München; Neuherberg Germany
| | | | - Y. Kosanke
- Technische Universität München; Munich Germany
| | - M. Kimm
- Technische Universität München; Munich Germany
| | - A. Nunes
- Technische Universität München, Munich, Germany, and Helmholtz Zentrum München; Neuherberg Germany
| | | | - M. Aichler
- Helmholtz Zentrum München; Neuherberg Germany
| | - A. Walch
- Helmholtz Zentrum München; Neuherberg Germany
| | | | - V. Ntziachristos
- Technische Universität München, Munich, Germany, and Helmholtz Zentrum München; Neuherberg Germany
| | - R. Meier
- Technische Universität München; Munich Germany
| |
Collapse
|
13
|
Baum T, Karampinos DC, Liebl H, Rummeny EJ, Waldt S, Bauer JS. High-resolution bone imaging for osteoporosis diagnostics and therapy monitoring using clinical MDCT and MRI. Curr Med Chem 2014; 20:4844-52. [PMID: 24083607 DOI: 10.2174/09298673113206660279] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 08/21/2013] [Accepted: 09/23/2013] [Indexed: 11/22/2022]
Abstract
Osteoporosis is classified as a public health problem due to its increased risk for fragility fractures. Osteoporotic fractures, in particular spine and hip fractures, are associated with a high morbidity and mortality, and generate immense financial cost. The World Health Organisation (WHO) based the diagnosis of osteoporosis on the measurement of bone mineral density (BMD) using dual-energy X-ray absorptiometry (DXA). However, BMD values of subjects with versus without osteoporotic fractures overlap. Furthermore, it was reported that the anti-fracture effects of drugs could be only partially explained by their effects on BMD. Bone strength reflects the integration of BMD and bone quality. The later can be partly determined by measurements of bone microstructure. Therefore, substantial research efforts have been undertaken to assess bone microstructure by using high-resolution imaging techniques, including high-resolution peripheral quantitative computed tomography (hr-pQCT), high-resolution multi-detector computed tomography (MDCT), and high-resolution magnetic resonance imaging (MRI). Clinical MDCT and MRI systems are broadly available and allow an adequate depiction of the bone microstructure at the clinically most important fracture sites, i.e. radius, spine and hip. Bone microstructure parameters and finite element models can be computed in high-resolution MDCT and MR images. These measurements improved the prediction of bone strength beyond the DXA-derived BMD and revealed pharmacotherapy effects, which are partly not captured by BMD. Therefore, high-resolution bone imaging using clinical MDCT and MRI may be beneficial for osteoporosis diagnostics and allow a highly sensitive monitoring of drug treatment, which plays an important role in the prevention of fragility fractures.
Collapse
Affiliation(s)
- T Baum
- Institut für Radiologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675 München, Germany.
| | | | | | | | | | | |
Collapse
|
14
|
Gramer BM, Phi van V, Rasper M, Rummeny EJ, Huber AM. Auswirkungen der iterativen Rekonstruktion auf CNR und SNR in „triple-rule-out“-Angiografie mit einem 256-Zeilen-MSCT. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1372915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
15
|
Jungmann P, Baum T, Schäffeler C, Sauerschnig M, Mann A, Ganter C, Bieri O, Rummeny EJ, Wörtler K, Bauer JS. Quantitative MR Bildgebung des Sprunggelenkes: Der Effekt axialer Traktion auf T2 Relaxationszeiten und Diffusionswerte des Gelenkknorpels. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
16
|
Holzapfel K, Regler J, Rechl H, Specht K, Eisenhart-Rothe RV, Gradinger R, Rummeny EJ, Wörtler K. Lokales Staging von Weichteilsarkomen: Prädiktion der Infiltration neurovaskulärer Strukturen mittels MRT in 174 Fällen. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
17
|
Berninger M, Imhoff AB, Rummeny EJ, Anton M, Vogt S, Henning TD. Entwicklung eines Tiermodells zur bimodalen magnetisch-optischen Bildgebung bei stammzellgestützter Knorpelersatztherapie im Kaninchen. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
18
|
Zahel T, Holzapfel K, Rummeny EJ. Beurteilung des Therapieansprechens von Lebermetastasen kolorektaler Karzinome: Wertigkeit der diffusionsgewichteten MRT. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1372847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
19
|
Gramer BM, Diez Martinez P, Chin AS, Sylvestre MP, Larivée S, Stevens LM, Noiseux N, Soulez G, Rummeny EJ, Huber AM, Chartrand-Lefebvre C. Die Evaluation von koronaren Herzbypässen mit einem 256-Zeilen MDCT: der Einfluss der Herzfrequenz, der Herzfrequenzvariabilität sowie der Lokalisation der z-Achse auf die Bildqualität. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1372926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
20
|
Maegerlein C, Fingerle AA, Souvatzoglou M, Rummeny EJ, Holzapfel K. Detektion von Lebermetastasen bei Patienten mit Adenokarzinomen des Gastrointestinaltraktes: Vergleich von [18F]FDG-PET-CT und MRTs. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1372846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
21
|
Baum T, Holzapfel K, Münzel D, Rummeny EJ, Gaa J. [Dysuria and unclear lesional mass in the bladder]. Radiologe 2013; 54:60-2. [PMID: 24193304 DOI: 10.1007/s00117-013-2590-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- T Baum
- Institut für diagnostische und interventionelle Radiologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, München, Deutschland,
| | | | | | | | | |
Collapse
|
22
|
Wildgruber M, Gaa J, Rummeny EJ. Magnetic resonance imaging-based diagnosis of congenital ureterocele. ROFO-FORTSCHR RONTG 2013; 185:999-1000. [PMID: 24490237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
|
23
|
|
24
|
Rauscher I, Loeffelbein DJ, Rummeny EJ, Eiber M. [Parry-Romberg syndrome as etiology of facial hemiatrophy]. ROFO-FORTSCHR RONTG 2013; 185:758-9. [PMID: 23696015 DOI: 10.1055/s-0033-1335243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
25
|
Zahel T, Wildgruber M, Schuster T, Rummeny EJ, Dobritz M. Schnelle Bestimmung des Lebervolumens und Segmentierung anhand neuer Algorithmen. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
26
|
Gramer BM, Muenzel D, Leber V, Rummeny EJ, Huber AM. Verbesserung von CNR und SNR bei der dynamischen Myokardperfusionsuntersuchung in der Computertomografie durch einen neuen iterativen Rekonstruktionsalgorithmus in einem Tiermodell. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
27
|
Wildgruber M, Bielicki I, Kosanke K, Settles M, Huber AM, Rummeny EJ, Botnar RM. Bildgebung des murinen Myokardinfarktes mittels eines Elastin-bindenden MRT Kontrastmittels. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
28
|
Heid I, Trajkovic-Arsic M, Esposito I, Gretzinger M, Schwaiger M, Rummeny EJ, Siveke J, Braren R. Multimodale Diagnostik der Pankreastumorheterogenität im endogenen Mausmodell. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
29
|
Trajkovic-Arsic M, Heid I, Esposito I, Steiger K, Teichmann N, Steingötter A, Menne D, Scholz A, Rummeny EJ, Siveke J, Braren R. ADC as therapy response marker for pancreatic ductal adenocarcinoma in genetically engineered mice. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
30
|
Gramer BM, Rasper M, Leber V, Rummeny EJ, Huber AM. Auswirkungen der verschiedenenEbenen der iterativen Rekonstruktion auf quantitative und qualitative Bildqualität in CCTA. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
31
|
Rauscher I, Ganter C, Martirosian P, Rummeny EJ, Holzapfel K. Evaluation von T1rho als potentieller MR-Biomarker der Leberzirrhose: Vergleich von gesunden Probanden und Patienten mit Leberzirrhose. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
32
|
Wildgruber M, Settles M, Kosanke K, Bielicki I, Rummeny EJ, Botnar RM, Huber AM. Etablierung einer phasen-sensitiven Inversion Recovery Sequenz zum delayed-enhancement Imaging des akuten Myokardinfarktes in der Maus mit einem klinischen MR Scanner. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
33
|
Groß C, Sayyed S, Kosanke Y, Settles M, Steingötter A, Menne D, Altomonte J, Esposito I, Feuchtinger A, Rummeny EJ, Braren R. Vergleichende Analyse verschiedener Tumormodellsysteme des HCC der Ratte. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
34
|
Gramer BM, Leber V, Leber A, Rasper M, Rummeny EJ, Huber AM. Auswirkungen der iterativen Rekonstruktion auf SNR und CNR in dynamischen Myokardperfusionsuntersuchungen mit einem 256-Zeilen-MSCT. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
35
|
Holzapfel K, Eiber M, Rummeny EJ, Loos M, Gaa J. Wertigkeit der diffusionsgewichteten MR-Bildgebung in der Diagnostik von Lymphknotenmetastasen bei Patienten mit extrahepatischen Cholangiokarzinomen. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
36
|
Jungmann PM, Bauer JS, Schäffeler C, Sauerschnig M, Mann A, Baum T, Rummeny EJ, Wörtler K. MR Bildgebung des Gelenkknorpels am OSG: Bessere Beurteilbarkeit durch axiale Traktion? ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
37
|
Rauscher I, Eiber M, Ziegler SI, Rummeny EJ, Schwaiger M, Beer AJ. PET-MRT zur Detektion von Lungenläsionen: Technische und diagnostische Evaluation im Vergleich zum PET/CT. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
38
|
Baum T, Gräbeldinger M, Grande Garcia E, Burgkart R, Patsch J, Rummeny EJ, Link TM, Bauer JS. Trabekuläre Knochenstrukturanalyse von Wirbelkörpern mittels klinischen MDCT: Kann damit die mechanische Versagenslast vorhergesagt werden? ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
39
|
Jungmann PM, Ganter C, Pohlig F, Schäffeler C, Bauer JS, Nittka M, Rummeny EJ, Wörtler K. View-Angle Tilting (VAT) und Slice-encoding Metal Artifact Correction (SEMAC) zur MR Bildgebung orthopädischer Tumor-Prothesen. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
40
|
Wildgruber M, Settles M, Herrmann K, Beer AJ, Rummeny EJ, Huber AM. Inversion-recovery single-shot cardiac MRI for the assessment of myocardial infarction at 1.5 T with a dedicated cardiac coil. Br J Radiol 2012; 85:e709-15. [PMID: 22919017 DOI: 10.1259/bjr/57965172] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess the diagnostic accuracy of imaging myocardial infarction with a two-dimensional (2D) single-shot inversion-recovery (IR)-gradient-echo (GE) sequence compared with a standard 2D segmented IR-GE sequence at 1.5 T using a dedicated cardiac coil. METHODS 22 patients with myocardial infarction documented in the past 3-12 months were examined at 1.5 T using a 5 channel cardiac coil. Imaging of delayed enhancement was performed 15 min after administration of 0.2 mmol of gadopentetate dimeglumine per kilogram of body weight. Immediately after completion of the single-shot sequence, which allows for coverage of the entire ventricle during a single breath-hold with nine slices, the segmented IR sequence was started. Infarct volumes, infarct transmurality and contrast-to-noise ratios (CNRs) of infarcted and healthy myocardium were compared between both techniques. RESULTS Despite a moderate, non-significant loss of CNR (CNR(single-shot IR)=31.2±4.1; CNR(segmented IR)=37.9±4.1; p=0.405), the 2D single-shot technique correctly determined infarct size when compared with the standard 2D segmented IR-GE sequence. Assessment of both infarct volume (r=0.95; p<0.0001) and transmurality (r=0.97; p<0.0001) is possible, with excellent correlation of both techniques. CONCLUSION Single-shot delayed enhancement imaging during a single breath-hold is feasible at 1.5 T with the use of a dedicated cardiac coil. Despite a moderately lower CNR, the single-shot technique allows for fast and accurate determination of infarct size with high spatial resolution and has the potential to reduce electrocardiogram and breathing artefacts.
Collapse
Affiliation(s)
- M Wildgruber
- Department of Radiology, Klinikum Rechts der Isar, Technische Universität München, Munich, Germany.
| | | | | | | | | | | |
Collapse
|
41
|
|
42
|
Gruber M, Bauer JS, Dobritz M, Beer AJ, Wolf P, Woertler K, Rummeny EJ, Baum T. Bone mineral density measurements of the proximal femur from routine contrast-enhanced MDCT data sets correlate with dual-energy X-ray absorptiometry. Eur Radiol 2012; 23:505-12. [PMID: 22932742 DOI: 10.1007/s00330-012-2629-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 07/13/2012] [Accepted: 07/25/2012] [Indexed: 01/15/2023]
Abstract
OBJECTIVES To evaluate the utility of femoral bone mineral density (BMD) measurements in routine contrast-enhanced multi-detector computed tomography (ceMDCT) using dual-energy X-ray absorptiometry (DXA) as the reference standard. METHODS Forty-one patients (33 women, 8 men) underwent DXA measurement of the proximal femur. Subsequently, transverse sections of routine ceMDCT of these patients were used to measure BMD of the femoral head and femoral neck. The MDCT-to-DXA conversion equations for BMD and T-score were calculated using linear regression analysis. The conversion equations were applied to the MDCT data sets of 382 patients (120 women, 262 men) of whom 74 had osteoporotic fractures. RESULTS A correlation coefficient of r = 0.84 (P < 0.05) was calculated for BMD(MDCT) values of the femoral head and DXA T-scores of the total proximal femur using the conversion equation T-score = 0.021 × BMD(MDCT) - 5.90. The correlation coefficient for the femoral neck was r = 0.79 (P < 0.05) with the conversion equation T-score = 0.016 × BMD(MDCT) - 4.28. Accordingly, converted T-scores for the femoral neck in patients with versus those without osteoporotic fractures were significantly different (female, -1.83 versus -1.47; male, -1.86 versus -1.47; P < 0.05). CONCLUSION BMD measurements of the proximal femur were computed in routine contrast-enhanced MDCT and converted to DXA T-scores, which adequately differentiated patients with and without osteoporotic fractures.
Collapse
Affiliation(s)
- M Gruber
- Department of Radiology, Division of Neuroradiology and Musculoskeletal Radiology, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Wildgruber M, Gaa J, Rummeny EJ. [Extracranial manifestations of tuberous sclerosis - characteristic findings in computed tomography]. ROFO-FORTSCHR RONTG 2012; 184:465-7. [PMID: 22510750 DOI: 10.1055/s-0031-1299341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
44
|
Noël PB, Bauer JS, Ganter C, Markus C, Rummeny EJ, Hauner H, Engels HP. Clinical pilot study for the automatic segmentation and recognition of abdominal adipose tissue compartments from MRI data. ROFO-FORTSCHR RONTG 2012; 184:548-55. [PMID: 22434368 DOI: 10.1055/s-0031-1299376] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
PURPOSE In the diagnosis and risk assessment of obesity, both the amount and distribution of adipose tissue compartments are critical factors. We present a hybrid method for the quantitative measurement of human body fat compartments. MATERIALS AND METHODS MRI imaging was performed on a 1.5 T scanner. In a pre-processing step, the images were corrected for bias field inhomogeneity. For segmentation and recognition a hybrid algorithm was developed to automatically differentiate between different adipose tissue compartments. The presented algorithm is designed with a combination of shape and intensity-based techniques. To incorporate the presented algorithm into the clinical routine, we developed a graphical user interface. Results from our methods were compared with the known volume of an adipose tissue phantom. To evaluate our method, we analyzed 40 clinical MRI scans of the abdominal region. RESULTS Relatively low segmentation errors were found for subcutaneous adipose tissue (3.56 %) and visceral adipose tissue (0.29 %) in phantom studies. The clinical results indicated high correlations between the distribution of adipose tissue compartments and obesity. CONCLUSION We present an approach that rapidly identifies and quantifies adipose tissue depots of interest. With this method examination and analysis can be performed in a clinically feasible timeframe.
Collapse
Affiliation(s)
- P B Noël
- Institut für Radiologie, Klinikum rechts der Isar, Technische Universität München.
| | | | | | | | | | | | | |
Collapse
|
45
|
Muenzel D, Noel PB, Dorn F, Dobritz M, Rummeny EJ, Huber A. Step and shoot coronary CT angiography using 256-slice CT: effect of heart rate and heart rate variability on image quality. Eur Radiol 2011; 21:2277-84. [PMID: 21710267 DOI: 10.1007/s00330-011-2185-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 04/21/2011] [Accepted: 05/09/2011] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To evaluate the effect of heart rate variability (HRV) and heart rate (HR) on intra-image "motion" and inter-image "stairstep" artefacts in step-and-shoot coronary CT angiography (CCTA) using a wide detector CT scanner. METHODS 66 patients underwent step-and-shoot CCTA using 256-slice CT. Patients were divided into two groups (Group 1: HR <65 bpm, Group 2 ≥65bpm). Motion artefacts were quantified using a 5-point-scale. Stairstep artefacts were defined by measurements of misalignment. Image noise, contrast-to-noise-ratio (CNR), signal-to-noise-ratio (SNR), and radiation dose were assessed. RESULTS Mean HR was 66 ± 16.7 bpm (range: 45-125 bpm) and mean HRV was 10.7 ± 17.5 bpm. A significant correlation between HR and stairstep artefacts (r = 0.46, p < 0.001) and motion artefacts (r = 0.63, p < 0.001) was found. Group 2 showed significantly increased step artefacts with a mean misalignment of 1.4 mm compared to 0.4 mm in Group 1 (p < 0.001). There was no significant effect of HRV on stairstep artefacts (r = 0.15, p = 0.416) and motion artefacts (r = 0.13, p = 0.311). No significant differences in image noise, CNR, SNR, and radiation dose were seen. CONCLUSIONS Unlike CCTA using narrow CT detectors, HRV has no significant effect on motion and stairstep artefacts using a wide CT detector with high z-coverage. However, a higher HR still increases stairstep and motion artefacts.
Collapse
Affiliation(s)
- D Muenzel
- Department of Radiology, Klinikum rechts der Isar der Technischen Universität München, Ismaninger Strasse 22, 81675 Munich, Germany.
| | | | | | | | | | | |
Collapse
|
46
|
Meier R, Thürmel K, Moog P, Noel P, Dorn F, Henninger M, Wildgruber M, Rummeny EJ, Wörtler K. Detektion von aktiver Entzündung bei Patienten mit undifferenzierter Arthritis mittels optischer Fluoreszenz-Bildgebung im Vergleich zur MRT. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1268311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
47
|
Baum T, Carballido-Gamio J, Huber MB, Müller D, Monetti R, Räth C, Eckstein F, Lochmüller EM, Majumdar S, Rummeny EJ, Link TM, Bauer JS. Automated 3D trabecular bone structure analysis of the proximal femur--prediction of biomechanical strength by CT and DXA. Osteoporos Int 2010; 21:1553-64. [PMID: 19859642 PMCID: PMC2912724 DOI: 10.1007/s00198-009-1090-z] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2009] [Accepted: 10/01/2009] [Indexed: 12/19/2022]
Abstract
SUMMARY The standard diagnostic technique for assessing osteoporosis is dual X-ray absorptiometry (DXA) measuring bone mass parameters. In this study, a combination of DXA and trabecular structure parameters (acquired by computed tomography [CT]) most accurately predicted the biomechanical strength of the proximal femur and allowed for a better prediction than DXA alone. INTRODUCTION An automated 3D segmentation algorithm was applied to determine specific structure parameters of the trabecular bone in CT images of the proximal femur. This was done to evaluate the ability of these parameters for predicting biomechanical femoral bone strength in comparison with bone mineral content (BMC) and bone mineral density (BMD) acquired by DXA as standard diagnostic technique. METHODS One hundred eighty-seven proximal femur specimens were harvested from formalin-fixed human cadavers. BMC and BMD were determined by DXA. Structure parameters of the trabecular bone (i.e., morphometry, fuzzy logic, Minkowski functionals, and the scaling index method [SIM]) were computed from CT images. Absolute femoral bone strength was assessed with a biomechanical side-impact test measuring failure load (FL). Adjusted FL parameters for appraisal of relative bone strength were calculated by dividing FL by influencing variables such as body height, weight, or femoral head diameter. RESULTS The best single parameter predicting FL and adjusted FL parameters was apparent trabecular separation (morphometry) or DXA-derived BMC or BMD with correlations up to r = 0.802. In combination with DXA, structure parameters (most notably the SIM and morphometry) added in linear regression models significant information in predicting FL and all adjusted FL parameters (up to R(adj) = 0.872) and allowed for a significant better prediction than DXA alone. CONCLUSION A combination of bone mass (DXA) and structure parameters of the trabecular bone (linear and nonlinear, global and local) most accurately predicted absolute and relative femoral bone strength.
Collapse
Affiliation(s)
- T Baum
- Institut für Röntgendiagnostik, Klinikum Rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675 Munich, Germany.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Artmann A, Boehm NA, Laemmer-Skarke I, Annecke K, Settles M, Jacobs VR, Kiechle M, Rummeny EJ. Morphological pattern of MR mammography in breast cancer patients with HER2 overexpression. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e11038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
49
|
Boehm NA, Laemmer-Skarke I, Paepke S, Jacobs VR, Kiechle M, Rummeny EJ, Artmann A. Prediction of disease-free nipple-areola complex in patients with extended DCIS by computer-assisted detection in breast MRI. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e11103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
50
|
Schegerer AA, Schlattl H, Dietz W, Renger B, Brunner C, Rummeny EJ, Hoeschen C. Cascaded systems analysis in conventional X-ray CT: a new, objective approach. Radiat Prot Dosimetry 2010; 139:439-442. [PMID: 20233757 DOI: 10.1093/rpd/ncq066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The objective of this study is to separately analyse the effects of detection and image reconstruction on computed tomography (CT) performance to characterise standard and new CT systems. The focus here was on the determination of quantifiable parameters, such as the modulation transfer function, noise power spectrum and quantum efficiency of the detector and the entire system, considering the CT image and the raw data set. Because of the conversion of raw data and image data to the absolute scale of the photon number, a quantitative comparison between the quality parameters of both data sets is possible in this approach. The effort of the proposed method using simple, standardised test phantoms is comparable with the effort in the quality control in classical projection radiography. For the first time, the quantum efficiency of a CT detector and the entire system that is used in the daily clinical practice could be determined. This system reached a quantum efficiency up to 12 %.
Collapse
Affiliation(s)
- A A Schegerer
- Helmholtz Zentrum München-German Research Center for Environmental Health, Institute for Radiation Protection, Ingolstädter Landstrasse 1, 85758 Neuherberg, Germany.
| | | | | | | | | | | | | |
Collapse
|