Sammer, M.* ; Teiluf, K. ; Girst, S.* ; Greubel, C.* ; Reindl, J.* ; Ilicic, K. ; Walsh, D.W.M.* ; Aichler, M. ; Walch, A.K. ; Combs, S.E. ; Wilkens, J.J. ; Dollinger, G.* ; Schmid, T.E.
     
 
    
        
Beam size limit for pencil minibeam radiotherapy determined from side effects in an in-vivo mouse ear model.
    
    
        
    
    
        
        PLoS ONE 14:e0221454 (2019)
    
    
    
		
		
			
				Side effects caused by radiation are a limiting factor to the amount of dose that can be applied to a tumor volume. A novel method to reduce side effects in radiotherapy is the use of spatial fractionation, in which a pattern of sub-millimeter beams (minibeams) is applied to spare healthy tissue. In order to determine the skin reactions in dependence of single beam sizes, which are relevant for spatially fractionated radiotherapy approaches, single pencil beams of submillimeter to 6 millimeter size were applied in BALB/c mice ears at a Small Animal Radiation Research Platform (SARRP) with a plateau dose of 60 Gy. Radiation toxicities in the ears were observed for 25 days after irradiation. Severe radiation responses were found for beams >= 3 mm diameter. The larger the beam diameter the stronger the observed reactions. No ear swelling and barely reddening or desquamation were found for the smallest beam sizes (0.5 and 1 mm). The findings were confirmed by histological sections. Sub-millimeter beams are preferred in minibeam therapy to obtain optimized tissue sparing. The gradual increase of radiation toxicity with beam size shows that also larger beams are capable of healthy tissue sparing in spatial fractionation.
			
			
				
			
		 
		
			
				
					
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        Publikationstyp
        Artikel: Journalartikel
    
 
    
        Dokumenttyp
        Wissenschaftlicher Artikel
    
 
    
        Typ der Hochschulschrift
        
    
 
    
        Herausgeber
        
    
    
        Schlagwörter
        Microbeam Radiation-therapy; Ray Microplanar Beams; Tumor; Optimization
    
 
    
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        Sprache
        englisch
    
 
    
        Veröffentlichungsjahr
        2019
    
 
    
        Prepublished im Jahr 
        
    
 
    
        HGF-Berichtsjahr
        2019
    
 
    
    
        ISSN (print) / ISBN
        1932-6203
    
 
    
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	    Band: 14,  
	    Heft: 9,  
	    Seiten: ,  
	    Artikelnummer: e0221454 
	    Supplement: ,  
	
    
 
  
        
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            Verlag
            Public Library of Science (PLoS)
        
 
        
            Verlagsort
            Lawrence, Kan.
        
 
	
        
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        Begutachtungsstatus
        Peer reviewed
    
 
     
    
        POF Topic(s)
        30203 - Molecular Targets and Therapies
30205 - Bioengineering and Digital Health
    
 
    
        Forschungsfeld(er)
        Radiation Sciences
Enabling and Novel Technologies
    
 
    
        PSP-Element(e)
        G-501300-001
G-500390-001
    
 
    
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        Erfassungsdatum
        2019-09-27