% IMPORTANT: The following is UTF-8 encoded. This means that in the presence % of non-ASCII characters, it will not work with BibTeX 0.99 or older. % Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or % “biber”. @ARTICLE{Pttgen:285053, author = {C. Pöttgen and C. Hoffmann and T. Gauler and M. Guberina and N. Guberina and T. Ringbaek and A. Santiago Garcia and U. Krafft and B. Hadaschik$^*$ and A. Khouya and M. Stuschke$^*$}, title = {{F}ractionation versus {A}daptation for {C}ompensation of {T}arget {V}olume {C}hanges during {O}nline {A}daptive {R}adiotherapy for {B}ladder {C}ancer: {A}nswers from a {P}rospective {R}egistry.}, journal = {Cancers}, volume = {15}, number = {20}, issn = {2072-6694}, address = {Basel}, publisher = {MDPI}, reportid = {DKFZ-2023-02196}, pages = {4933}, year = {2023}, abstract = {Online adaptive radiotherapy (ART) allows adaptation of the dose distribution to the anatomy captured by with pre-adaptation imaging. ART is time-consuming, and thus intra-fractional deformations can occur. This prospective registry study analyzed the effects of intra-fraction deformations of clinical target volume (CTV) on the equivalent uniform dose (EUDCTV) of focal bladder cancer radiotherapy. Using margins of 5-10 mm around CTV on pre-adaptation imaging, intra-fraction CTV-deformations found in a second imaging study reduced the 10th percentile of EUDCTV values per fraction from $101.1\%$ to $63.2\%$ of the prescribed dose. Dose accumulation across fractions of a series was determined with deformable-image registration and worst-case dose accumulation that maximizes the correlation of cold spots. A strong fractionation effect was demonstrated-the EUDCTV was above $95\%$ and $92.5\%$ as determined by the two abovementioned accumulation methods, respectively, for all series of dose fractions. A comparison of both methods showed that the fractionation effect caused the EUDCTV of a series to be insensitive to EUDCTV-declines per dose fraction, and this could be explained by the small size and spatial variations of cold spots. Therefore, ART for each dose fraction is unnecessary, and selective ART for fractions with large inter-fractional deformations alone is sufficient for maintaining a high EUDCTV for a radiotherapy series.}, keywords = {bladder cancer (Other) / dose accumulation (Other) / equivalent uniform dose (Other) / online adaptive radiotherapy (Other)}, cin = {ED01}, ddc = {610}, cid = {I:(DE-He78)ED01-20160331}, pnm = {899 - ohne Topic (POF4-899)}, pid = {G:(DE-HGF)POF4-899}, typ = {PUB:(DE-HGF)16}, pubmed = {pmid:37894299}, pmc = {pmc:PMC10605897}, doi = {10.3390/cancers15204933}, url = {https://inrepo02.dkfz.de/record/285053}, }