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The 24-hour stop-work, the second this week and fourth overall, was due to end at 7am today.
Technologists, who are members of the Apex health professionals union, had gone on strike as part of a continuing employment dispute, in which the union and DHBs are disputing safe staffing provisions and issues over professional development.
The union has said it would continue its campaign until district health boards made what it regarded as a suitable offer.
''Our contingency planning team has continued to do an outstanding job,'' SDHB surgical service and radiology general manager Janine Cochrane said.
''All patients in life-threatening situations have had access to the X-ray or scans if they have needed one.''
Several elective procedures which needed post-operative scans had been postponed, but operating theatres were still busy, Ms Cochrane said.
''Every effort has been made to fit patients who require radiology in on other days, working around the strike periods to provide services.''