Historical image showing Gordon Isaacs, the first patient treated with linear accelerator radiation therapy ( in this case an electron beam ) for retinoblastoma in 1957.

Historical image showing Gordon Isaacs, the first patient treated for retinoblastoma with linear accelerator radiation therapy ( in this case an electron beam ), in 1957, in the U. S .. Other patients had been treated by linac for other diseases since 1953.

Historical image showing Gordon Isaacs, the first patient treated with the linear accelerator ( external beam radiation therapy ) for retinoblastoma in 1957.

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