The move is part of a rolling programme to replace or upgrade the department's radiology equipment.
Thousands of PCS members at HM Revenue and Customs will go on strike on Monday as part of the rolling programme of action.
Mr Wadsworth said the whole scheme was "on target" but he was unable to give a completion date because it was a "rolling programme".
Transport Secretary Philip Hammond said it was a "rolling programme" but said passengers would start to see the benefits "within the next few months".
The warning came as civil servants at the DfE began a rolling programme of industrial action over the cuts announced in the Department for Education Review last November.
Schools across the country are likely to be affected by the rolling programme of walkouts by members of the the National Union of Teachers and the NASUWT, along with a national strike before Christmas.
"We will also be rolling this programme out to non-mainstream education settings in order to do more to tackle those most at risk, " said the spokesman.
Every other year, artists from around the world will be invited to develop contemporary artwork for the landmark site as part of a rolling art programme.
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Hertz has followed Zipcar's lead by rolling out a programme called Connect by Hertz, which allows people to hire cars for relatively short spells.
Oganisers say they have addressed their concerns this year by using a permanent team of 28 police motorcyclists to enforce a rolling road closure programme.
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Scotland holds the key to getting Labour's reform programme rolling.
The NHS is currently rolling out a programme of providing people with access to computerised CBT and the government has set up 10 pilots to explore ways of speeding up access to talking therapies.
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Chief Medical Officer Dr Michael McBride said rolling out a wider programme "could protect children and help to further protect our most vulnerable members of society".
Senior Republicans I have spoken to in the state candidly admit that the programme of cutting the deficit and rolling back the state cannot create jobs overnight.
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