Consultant radiologist Dr Dawar Siddiqi has been found guilty of poor professional performance, by a fitness to practice committee of the Medical Council, after a five day inquiry.
It found that in 11 of 20 CT scan reports, he had made serious errors.
The committee said it was satisfied the errors amounted to a serious failure by Dr Siddiqi to meet the standards of competence, in knowledge and skill expected.
The committee said that the circumstances he found himself in at Bantry were "far from satisfactory" and included a change of systems when he was the sole radiologist.
It also found that he was recruited on the basis of his CV which said he was a consultant, but this was not the case.
A decision on what sanction to apply will be decided at a full meeting of the Medical Council at a later date.
Dr Siddiqi left the inquiry before the verdict was delivered this evening.
On the sixth day and final day of the inquiry, a radiology manager at Bantry General rejected claims by Dr Siddiqi that he had issued addendums to some reports, or that some were unsigned by him.
Radiography services manager Róisín O'Carroll said were no second reports or addendums to two reports, as claimed by Dr Siddiqi.
In one of these cases, it is alleged Dr Siddiqi missed the spread of a cancer while in another it is alleged he identified a haemorrhage instead of a brain tumour.
In the case of a third CT scan report, she said the fitness to practice committee could be confident that it was the final one signed by Dr Siddiqi, which did not identify possible cancer recurrence.
Dr Siddiqi claimed it was an unsigned report and it was unclear whether it was his CT report.
Ms O'Carroll also said that during Dr Siddiqi's time at Bantry, the overall number of CT scans to report on decreased by around a quarter compared with the previous year.
She said that Dr Siddiqi did have difficulty coming to terms with new voice recognition technology, in the move to digital recording of CT scan reports.
In his closing submission for the Medical Council, barrister JP McDowell said the most concerning part of the inquiry, was Dr Siddiqi's lack of insight into the shortcomings in his abilities.
He said Dr Siddiqi had blamed Bantry Hospital and despite the heavy workload, being single-handed and other mitigating factors, the hospital did its best to assist him.
Mr McDowell said that Bantry were also entitled to rely on Dr Siddiqi to provide a reliable service.
But he did not have the knowledge or experience to report CT scans on his own, no matter what the circumstances at the hospital were.
He said the evidence had shown 20 cases where there were serious errors and this was poor professional performance.
In his closing submission, Dr Siddiqi said he felt handicapped in the inquiry from day one.
He said he had no knowledge of how the case would be tried and that the council should have provided him with more information on how it would proceed.
He also had thought there were only two allegations.
Dr Siddiqi said another audit of the 62 cases by the Faculty of Radiology found just three errors.
He has handed in a written final submission to the fitness to practice committee.
Dr Siddiqi has represented himself at the inquiry.