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stent volume artery cycle motion patient target target volume treatment study restenosi tumor interval heart radiotherapy radiation biplane artery stents artery in-stent restenosis high-precision high-precision ebrt position heart volume angiography radiat imaging range point artery stent stereotactic effect oncol chapter image stented planning displacement in-stent stent volume measurement phase irradiation endovascular brachytherapy beam irradiation r-r interval strategy therapy brachytherapy stereotactic body frame multislice lung tumor motion centerline tomography direction result leter stereotactic radiation therapy spiral method technique stent length figure breathing comparison frame endovascular system dataset reconstruction systolic phase definition artery stent position length stent volumes beam radiotherapy purpose motion effect scanner conformal margin