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RT preparation

User
Posted 13 Oct 2026 at 05:44

I have my CT planning scan next week and the preparations are very strict.I have to drink 2 litres of water every day for a week. I have to also train my bladder to wait an hour before emptying. How...! When I need to pee there is no waiting...!

Also a lot of rules regarding cutting gassy foods from my diet. Seems very restrictive.

Does all this continue each day whilst having the 20 RT sessions?

How did you get on with these rules -- or did you just use them as a guide...?

What happens each day? Is there a strict timing involved?

Thanks

User
Posted 13 Oct 2026 at 17:52

My husband followed the low gas low fibre diet starting a couple of weeks  before the RT started. He also drank at least 2 litres of water a day and swapped to decaf tea. 

 

yes it’s bland, chicken, fish, no veg,  white rice bread and potatoes rather than brown. But he chose to do it as he was told that  it helps to keep things in the right place, the bowel out of the way, and minimise rectal damage. 

he was given a mini enema to use daily first thing, but 3 weeks in no longer needed it as motions were a bit loose anyway. 

after the treatment was complete he reintroduced his normal diet over a week/10 days.

 

Yes it was bland, yes we craved fruit veg and stuff but it seemed the right thing to do to get through the RT without being sent away due to gas and minimising possible future rectal issues. 

if he does get problems which hopefully he won’t he knows he did his best to avoid them. 

it’s not for everyone 🙂 

 

in our case he had breakfast drank and used the enema and kept up fluid intake. We didn’t get the same time each day for treatment but he kept up the same routine regardless, and we knew the timetable in advance which did help us plan things around it. It worked for him.

 

It was nice to return to normality!

User
Posted 13 Oct 2026 at 18:24

Hi,

My oncologist advised me to start a low residue diet before treatment which messed up the planning scan as my colon wasn't completely empty despite the enema so I had to do it all over again a week later. Second attempt was a success because I reintroduced fibre in my diet, who'd a thought. Then on the advice of the radiologist I didn't change my diet at all during treatment, just avoid foods that create gas. Ideally you want to have a natural bowel movement when you get there. You will have to drink a few cups of water in the waiting room before your treatment. They will ultrasound you before the treatment, or pre scan you, to make sure you bladder is full enough. It is better to be too full than not full enough, or they will send you out to drink more water which delays your treatment. If too full you will be able to empty a bit in one of those cardboard recipticles in the treatment room, it's not glamorous. I have to warn you the timimg is not strict, you can have delays due to other patients not preparing properly, or worse machine breakdowns which happened to me twice. In that instance I was sent home and had to come back the weekend or following day. It is best not to overthink it on the day, the actual treatment only last about 240 seconds. You will hopefully get into a rhythm and find out exactly how much water is enough as I did after a few fractions.

All the best, 

hawkz

Edited by member 13 Oct 2026 at 18:46  | Reason: Not specified

User
Posted 13 Oct 2026 at 18:36
Yes, like hawkz, i was told not to change diet (this was Clatterbridge, Wirral) as in their experience its change that can cause issues. Tho I was advised to give wind causing stuff a miss. The routine for me was mini enema upon getting to hospital then wait for staff to tell me to drink 3 cups of water, when they knew I was due on table in 10-15 mins or so. This was in 2016.

As you'll find ther's no set procedure, I coped fine with my procedures especially as I live less than 10 mins from clatterbridge.

Peter

User
Posted 15 Oct 2026 at 20:22

Originally Posted by: Online Community Member

I have my CT planning scan next week and the preparations are very strict.I have to drink 2 litres of water every day for a week. I have to also train my bladder to wait an hour before emptying. How...! When I need to pee there is no waiting...!

Also a lot of rules regarding cutting gassy foods from my diet. Seems very restrictive.

Does all this continue each day whilst having the 20 RT sessions?

How did you get on with these rules -- or did you just use them as a guide...?

What happens each day? Is there a strict timing involved?

Thanks

 

This is what happens each day (at least in Oxford). What a Typical RT session looks like

The main side effect I had was bowel irritation and abnormally high levels of intestinal gas. Couple the excess farts with the insecurity that you might crap yourself and you will understand why it is recommended to avoid gassy food.

When I was three weeks in, I decided to try a beer as I hadn't had one for three weeks. It was great. Loved it. But it made me fart more than if I hadn't had it.

At the end of the day, you will have to decide what restrictions you can live with, but the closer you stick to the recommendations, the more likely it will all go well. It was during week 4 that I found the bowel particularly irritated and that lasted a few days after, but stopping the laxative enemas certainly contributed towards greater feeling of "security" when farting.

A week after finishing I had two beers. Quite a bit of farting. Yesterday (11 days post RT completion) I had four and didn't notice any excess farts. So I reckon I'm back to normal now.

At the end of the day though, they are only guidelines and you will have to see what you can tolerate because we are all different.

Edited by member 15 Oct 2026 at 20:23  | Reason: Not specified

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