87,313 research outputs found
Rheinfahrt - von den Quellen des Rheins bis zum Meere
No full textSchilderungen von Karl Stieler; H. Wachenhusen; F. W. Hackländer. Ill. von R. Püttner ... Holzschnitte von A. CloßIn Fraktu
Die Schweiz
No full textneue Bearbeitung von F. StülpnagelMaßstab in graph. Form (Geogr. Meil, Stunden). - Mit Bergstrichen. Titelkartusche oben links, Legende u. Maßstabsleisten unten linksAus: Stieler' Hand-Atlas ; Nr. 3
Die Ostindischen inseln [cartographic material] /
No full textMap of Southeast Asia with relief shown by hachures.; Inset: Niederlande im Maassstab der Hauptkarte.; Note: Nachtrage bis 1872.; Prime meridians: Ferro and Greenwich.; Plate No. 44c from: Hand atlas uber alle Theile der Erde und uber das Weltgebaude [Neue auf.] / by A. Stieler.; Phillips, 881.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-rm2520
A novel surface imaging system for patient positioning and surveillance during radiotherapy A phantom study and clinical evaluation
No full textBackground. The use of optical surface positioning to support or replace X-ray-based image-guided radiotherapy (IGRT) may reduce patient exposure to extra dose. In specifically designed phantom tests, we analyzed the potential of a new scanning device preclinically. The system's clinical performance was evaluated in comparison to cone-beam computed tomography (CBCT) in a prospective study. Materials and methods. We first evaluated the scanning performance in terms of accuracy and reproducibility using phantom tests. An institutional review board (IRB)-approved clinical evaluation encompassing 224 fractions in 13 patients treated in three different regions (head and neck, thorax, pelvis) was then performed. Patients were first positioned using CBCT and then scanned with the Catalyst(TM) (C-RAD, Uppsala, Sweden) optical system to define the resulting difference vector. Results. Individual system settings are necessary for different scanning conditions. Reproducibility tests with phantoms showed a mean difference of 0.25 +/- 0.21 cm. Accuracy tests showed a mean difference of less than 0.52 +/- 0.41 cm. Considering all patients, clinical data showed residual target position differences between Catalyst(TM) (surface-driven) and CBCT (target-driven) systems within 0.07 +/- 0.28 cm/-aEuro parts per thousand 0.13 +/- 0.40 cm/0.15 +/- 0.36 cm/0.11 +/- 1.57A degrees/-aEuro parts per thousand 0.43 A +/- 1.68/-aEuro parts per thousand 0.10 A +/- 1.67A degrees (lateral/longitudinal/vertical/rotation/roll/pitch). Conclusion. Scanning quality depends on the color and shape of the scanned surface. Upon prospective clinical evaluation, excellent agreement between target- and contour driven positioning was observed. Catalyst(TM) may reduce CBCT scan frequency in patients where tumor location is fixed relative to the surface
Clinical evaluation of a commercial surface-imaging system for patient positioning in radiotherapy
No full textLaser scanning-based patient surface positioning and surveillance may complement image-guided radiotherapy (IGRT) as a nonradiation-based approach. We investigated the performance of an optical system compared to standard kilovoltage cone-beam computed tomography (CBCT) and its potential to reduce the number of daily CBCTs. We analyzed the patient positioning of 153 treatment fractions in 21 patients applied to three different treatment regions. Patients were first scanned with CBCT, shifted to the optimal isocenter position, and an optical scan was performed to verify the matching in relation to CBCT. For the head-and-neck region, the lateral/longitudinal/vertical/rotational/roll and pitch shift was 0.9 +/- 1.8 mm/-2.7 +/- 3.8 mm/-0.8 +/- 3.6 mm/0.0 +/- 1.1A degrees/-0.5 +/- 2.1A degrees/0.2 +/- 1.6A degrees. For the thorax, the lateral/longitudinal/vertical/roll and pitch shift was -1.2 +/- 3.6 mm/0.8 +/- 5.1 mm/0.8 +/- 4.3 mm/0.6 +/- 1.4A degrees/0.1 +/- 0.9A degrees/0.3 +/- 1.0A degrees. For the pelvis, the respective values were -2.5 +/- 4.1 mm/4.6 +/- 7.3 mm/-5.1 +/- 7.4 mm/0.3 +/- 1.1A degrees/-0.5 +/- 1.0A degrees/0.3 +/- 2.1A degrees. In total, the recorded disagreement was -1.0 +/- 3.6 mm/1.0 +/- 6.3 mm/-1.8 +/- 5.9 mm/0.3 +/- 1.2A degrees/-0.3 +/- 1.5A degrees/0.2 +/- 1.7A degrees. This analysis showed good agreement between the optical scanner approach and CBCT. The optical system holds potential to ensure precise patient positioning and reduced CBCT frequency in tumor locations with fixed relation to surface structures
Intensity modulated radiosurgery of brain metastases with flattening filter-free beams
No full textPurpose: Flattening filter free (FFF) irradiation potentially reduces treatment delivery time in radiosurgery thus eliminating intrafraction motion and increasing patient comfort. We compared plan quality and efficiency of VMAT and IMRT plans for FFF- and standard delivery for brain metastases with single fraction doses of 20 Gy and validated the dosimetric accuracy of the FFF delivery. Material and Methods: CT data of 15 patients with brain metastases were included in this study. For every patient, 2 IMRT- and 2 VMAT-plans were created using a high-resolution MLC with two different delivery modes (6 MV standard vs. 6 MV FFF). Plan quality and efficiency was assessed by analysis of conformity, homogeneity, dose gradients, treatment delivery time and number of monitor units (MU). Dosimetric evaluation was performed for 10 FFF plans with radiochromic film and ion chamber. Results: Plan quality was similar for both approaches. FFF provided a mean treatment time reduction of 51.5% with similar MU for VMAT and IMRT for this low-modulation paradigm. The dosimetric validations showed an absolute dose deviation of +0.93 +/- 0.99% and gamma-index analysis (3%/3 mm and 3%/1 mm) resulted in agreement of 99.08 +/- 1.58% respectively 93.46 +/- 2.41%. Conclusion: FFF radiosurgery is an efficient technique for intensity modulated hypofractionated or single fraction treatments with similar plan quality when compared to flattened beams at reduced treatment time. (C) 2013 Elsevier Ireland Ltd. All rights reserved
Australien und Polynesien in Mercators projection [cartographic material] /
No full textMap of Australia and Polynesia with relief shown by hachures. European colonies shown in different colours.; In German.; In upper right margin: Ausg. in 63 Bl. No. LXII.; In lower right margin: Gestochen v. C. Poppey.; Prime meridians: Greenwich and Ferro.; Plate no. 50a from: Hand-Atlas / Adolf Stieler. Gotha : Perthes, [1862?]; National union catalog pre-1956 imprints. v. 569, p. 476.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-rm3273
Oestliche Halbkugel [cartographic material].
No full textHemispherical map of the Eastern Hemisphere with relief shown by hachures.; In German.; "Entw. u. gez. von F. v. Stulpnagel."; "Gest. von. J.C. Ausfeld u. W. Alt."; Plate no. 9 probably from: Stieler's Hand-Atlas uber alle Theile der Erde und uber das Weltgebaude. Gotha : Justus Perthes, [1876?]; Phillips, 881.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-rm3159
Oestliche Halbkugel [cartographic material] /
No full text1832. Revidirt 1845. Hemispherical map of the Eastern Hemisphere with relief shown by hachures.; "Entw. u. gez. von F. v. Stulpnagel. 1832. Revidirt 1845."; "Gestochen von Johann Carl Ausfeld."; Plate no. 7 probably from: Stieler's Hand-Atlas uber alle Theile der Erde und uber das Weltgebaude. Gotha : Justus Perthes, 1847?; Top right-hand corner: Ausgabe in 63 Bl. No. V. Stieler's Hand-Atlas (No. 7.); Tooley, 1200.; National Union Catalogue of pre-1956 imprints, v. 569, p. 477.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-t1200
Australien und Polynesien in Mercators projection [cartographic material] /
No full textMap of Australia and Polynesia with relief shown by hachures. European colonies shown in different colours.; In upper right margin: Ausg. in 63 Bl. No. LXII.; In lower right margin: Gestochen v. C. Poppey.; Prime meridians: Greenwich and Ferro.; Plate no. 50a from: Hand-Atlas / Adolf Stieler. Gotha : Perthes, [1862?]; National union catalog pre-1956 imprints. v. 569, p. 476.; Tooley, 1204.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-t1204
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