Hungarian Radiology

[Dual energy computed tomography - dual-source CT]


MAY 15, 2010

Hungarian Radiology - 2010;84(01)

[The authors describe fundamentals of computed tomography (CT) examination performed by dual-source, dual energy CT scanner. The special applications of dual energy acquisition are demonstrated, e. g. examination of pulmonary perfusion in case of embolism, bone subtraction during CT angiography, differentiation of various stones and calcifications. The dual energy acquisition can improve the accuracy and sensitivity of the radiological diagnosis.]



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[Web 2.0 applications in health care and diagnostic imaging - Part II. - Typical Web 2.0 services]


Hungarian Radiology

[Dr. Beáta Kovács was awarded Lányi-prize in 2009]


Hungarian Radiology

[Leaping forward - Hungarian Radiology Online has started!]


Hungarian Radiology

[Farewell to dr. Levente Lukács 1984-2010]

HÜTTL Kálmán

Hungarian Radiology

[Radiological assessment of the combined high tibial osteotomy in the frontal plane]

PAPP Miklós, KÁROLYI Zoltán, FAZEKAS Péter, SZABÓ László, PAPP Levente, RÓDE László

[INTRODUCTION - High tibial osteotomy (HTO) is a generally accepted treatment for medial unicompartmental osteoarthritis of the knee with varus alignment. The main principle of HTO is to achieve a transfer of loading from diseased, arthritic areas of the joint to areas with relatively intact, healthly cartilage. This stress reduction can be achieved with correction of the loading axis. A stress reduction occurs in the medial compartment of the knee when the loading axis is transferred from the medial compartment to just lateral to the center of the joint. PATIENTS AND METHODS - We performed radiological assessment of 52 knees preoperatively and after combined high tibial osteotomy (CO) in the 10th postoperative week, in the 12th postoperative month and in the 5th postoperative year on a standing weight-bearing anteroposterior radiograph. CO involved performing a proximal osteotomy parallel to the tibial plateau, followed by a distal osteotomy extending from the lateral part of the tibia to the line of the proximal osteotomy at the center of the tibial condyle. After closure of the lateral part of the osteotomy and consequent opening of the medial part, the removed lateral bone wedge was transferred to the gap on the medial side. Pre- and postoperatively we measured the lateral angle between the anatomic axis of the femur and the distal articular surface of the femur (FCFS), the lateral angle between the anatomic axis of the tibia and the proximal articular surface of the tibia (TP-TS) and the lateral angle between the distal articular surface of the femur and the proximal articular surface of the tibia (the articular component of the varus deformity FC-TP). We determined the FTA as a sum of FC-FS, TP-TS and FC-TP. RESULTS - The FC-TP, the TP-TS and the FTA decreased significantly after CO according to data measured in the 10th postoperative week. We achieved the planned correction (FTA 171-169°) in 77% of cases. Undercorrection (FTA ≥172°) was detected in 7, overcorrection (FTA ≤168°) was noted in 5 cases. We detected significant loss of correction between the 10th postoperative week and the 12th postoperative month (the FTA increased significantly, the loss of correction was 1° in 26 cases, 2° in 7 cases). The valgus alignment did not increase in any case. The articular component did not change in 36 cases. We did not note significant loss of correction and the valus alignment did not increase in any case between the 12th postoperative month and 5th postoperative year. We noted the recurrence of varus deformity in 1 case. We detected loss of correction due to increasing articular component in further 4 cases. The FC-FS did not change during the first 5 postoperative years. CONCLUSION - If we achieved the planned correction (FTA 171-169°) according to data measured in the 10th postoperative week on a standing weight-bearing anterposterior radiographs, we did not detect recurrence of varus deformity in any case during the first 5 postoperative years. If the articular component (FC-TP) did not change between the 12th postoperativ month and the 5th postoperative year (in 61.5% of cases), in our opinion we achieved the optimal correction.]

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[Background and purpose - Introducing the multidisciplinary paleoradiology research at the Institute of Diagnostic Imaging and Radiation Oncology of the Kaposvár University, highlighting the cases with potential central nervous system involvement - from the scanning methods to the 3D printing - in order to draw attention to the historical background and clinical aspects of certain pathological conditions. Methods - The authors developed the examination protocols for three different CT scanners. Among the examined archaeological remains cranial lesions were identified in 26 cases, from which 4 cases with potential central nervous system involvement are demonstrated. The scanning parameters and the advantages of secondary image reconstructions (multiplanar reconstruction, maximum intensity projection, three-dimensional volume rendering technique) are presented with the cases. Results - The authors demonstrate a case with destructive skull lesions due to syphilis from the 15th century AD, a condition rarely seen or even unknown nowadays in the modern world. With the CT images of the skull base fracture from the Iron Age, signs of healing could be verified. Using the CT images a non-invasive approach is presented in the case of the craniofacial osteosarcoma in order to visualize the local status and the direct intracranial propagation. Advantages of the 3D VRT reconstructions are shown in the case of unilateral coronal suture synostosis. Conclusion - Paleoradiological CT examinations serve as a non-invasive, non-destructive tool for studying archaeological remains and artifacts. The special applications provided by the imaging modality contribute to the conventional paleopathological investigations. Keywords: paleoradiology, computed tomography, 3D reconstruction, skull lesions, paleopathology]

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[Gastrointestinal stromal tumors]


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Hungarian Radiology

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