CT Scan (Virtual Colonoscopy) During the scan, you are placed on a movable table, which slides into the centre of a large donutshaped machine that takes X-ray images around the body. The actual procedure usually takes about half an hour or less, but it may sometimes take two hours or more.
A CT Scan Virtual Colonoscopy uses X-ray to obtain an internal view of the colon (the large intestine). It is a less invasive procedure that able to produce 3-Dimensional images of the colon to detect abnormalities such as polyps or colorectal cancer. CT scan is a painless, non-invasive and accurate examination. X-ray dye may be injected intravenously, taken by mouth in order to highlight the colon.
Risks X-ray radiation A CT scan involves exposure to a small amount of X-ray radiation and there are risks related to radiation exposure. However, the benefits often outweigh the risk. Contraindications: • Pregnancy • Previous severe allergic reaction What is X-ray dye? X-ray dye is a special liquid, known as contrast medium. It is injected intravenously through a small tube placed in a vein, often in your forearm during a CT scan to better define and enhance blood vessels and to outline abnormal tissue and organs.
Risks of X-ray dye i) Allergy Some patients may develop allergic reactions to X-ray dye. These are usually mild and will spontaneously disappear. Allergic reactions may include headache, sneezing, vomiting, confusion, weakness, warmth, sweating, nervousness, difficulty in breathing, sickness in stomach, metallic taste, watery eyes, itchy eyes, itchy bumps on skin, red-colored skin, pale skin or uncontrollable shaking. ii) Extravasation There is also a very small risk of extravasation, whereby the X-ray dye leaks out into the surrounding tissues in your arm causing swelling. iii) Kidney damage There may be a small chance of kidney damage if you have any of the following conditions:pre-existing renal insufficiency, Diabetes mellitus, on nephrotoxicdrug, hypertension, hyperuricemiaor gout. Please inform your doctor if you have any of the above conditions. You will need a blood test to check your creatinine level, prior to the CT scan with intravascular X-ray dye. Depending on the degree of preexisting kidney damage, the IV contrast enhanced CT scan may or may not proceed. This is to protect your kidneys from further damage.
Important Points to Note 1. Please inform us if you have asthma, diabetes, renal problems or any drug allergy 2. It is recommended that you drink 500 ml of plain water before the scan and 250 ml of plain water every hour for 8 hours after the scan if you are not on fluid restriction 3. Patients who are diabetic may require to stop METFORMIN on the day of the scan and to resume after 48 hours of the scan. 4. Patient with asthma or has 3 or more different classes of drugs allergies will be given premedication. 5. If you have asthma / previous minor reaction to injection of contrast media, your doctor may have prescribed Prednisolone 10mg three times daily a day prior of the CT examination. 6. Please take the medication as advised before coming for the CT scan. 7. Do inform your doctor and the CT radiographer if you are pregnant or unsure if you are pregnant. 8. Must complete dietary advice and bowel preparation as instructed in this leaflet. If your bowel is not clean before the CT examination, it will be difficult for the doctor to interpret the study accurately. 9. Appointments may require rescheduling or cancellation in some cases where the bowel is not able to be emptied or cleansed sufficiently.
Preparing for your scan •
To get a better view at the lining of colon, it is necessary to cleanse your bowel. Thus, you will be required to follow a low residue diet for three days before the examination to clear your bowel. Please refer to the other brochure on this.
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Bowel preparation (please refer to the bowel preparation instructions in this brochure)
On the day of the scan .Fast for 6 hours .Only plain water is allowed You may continue your regular medications any time with sips of water After the scan •
You may feel a cramping or abdominal discomfort which may require you to visit the toilet.
•
There is usually no restriction after having a CT scan. You may resume your normal activities unless advised otherwise by the radiographer or your doctor.
Bowel preparation Instruction for patient Normal Bowel Preparation CT Examination Date: _____________ • Do not eat or drink 6 Hours before appointment • Take daily medicines as prescribed with small sips of water 3 days before CT examination date: ___________ • Take low residue diet • Please avoid fruits, vegetables, seeds, nuts, high fiber and whole grain foods Day before:______________(date) • To take low residue diet for breakfast and lunch • Take clear liquids only after lunch onwards (NO solid food)
At 9 am: • Take 2 tablets of Bisacodyl (5mg each) with 1 cup (approx. 500ml) of plain water and 1 bottle of Tagitol V • Proceed with normal activities At 3 pm: • Pour 40 ml of the Lemon Sweet Purgative into full glass (approx. 500 ml) of plain water • Drink this mixture and take 1 bottle of Tagitol V At 6 pm: • Pour 40 ml of the Lemon Sweet Purgative into full glass (approx. 500 ml) of plain water • Drink this mixture and take 1 bottle of Tagitol V
PEG Bowel Preparation CT Examination Date: _____________ • Do not eat or drink 6 Hours before appointment • Take daily medicines as prescribed with small sips of water 3 days before CT examination date: ___________ • Take low residue diet • Please avoid fruits, vegetables, seeds, nuts, high fiber and whole grain foods Day before:______________(date) • To take low residue diet for breakfast and lunch • Take clear liquids only after lunch onwards (NO solid food)
At 9 am: • Take 1 bottle of Tagitol V • Proceed with normal activities At 3 pm: • Take 1 bottle of Tagitol V • 1 Sachet of PEG into 1 litre of water At 6 pm: • Take 2 tablets of Bisacodyl (5mg each) with 1 cup (approx. 500ml) of plain water and 1 bottle of Tagitol V • 1 Sachet of PEG into 1 litre of water Reminder Please be punctual for your appointment. If you are unable to keep the appointment, kindly call us to arrange a new appointment date. Tel: (65) 66022700 (Office Hours: 8 am - 5 pm Mon to Fri and 8 am to 12 pm Sat) The use of Iodine based contrast media may result in a transient impairment of renal function and this may precipitate lactic acidosis in diabetics who are taking Metformin). If you have asthma / previous minor reaction to injection of contrast media, your doctor may have prescribed Prednisolone 10mg three times daily a day prior of the CT examination.
Low Residue Diet
Main
ALLOWED Plain porridge
Meat & Alt
AVOID Whole-grains bread
ALLOWED Steamed egg/ hard boiled egg
Oats White rice
Poultry Brown rice
Noodles/ beehoon/pasta
White bread
Wholemeal noodle Wholemeal biscuit
Fruits & Vegetables
ALLOWED
AVOID
Fish
Tofu
Dairy Pr
ALLOWED Not more than 2 cups a day of: Milk, plain yogurt, yakult, ice cream, soymilk
Clear fruits/vegetable juice with no pulp
Whole vegetable/ whole fruits, canned fruit
Milo
ternatives
AVOID All beans
Peanut butter
Soup & Beverages
ALLOWED
AVOID
Broth, bouillon
Unstrained soup
Strained cream soup
Fried egg
Nuts, seeds, sesame
roducts
Malt beverages
Snacks & Others
AVOID
ALLOWED Pudding, jelly
Bubble tea, beverages with nata de coco
Fruit yogurt
AVOID Coconut meat, shredded coconut
Honey, syrup
Satay sauce
Butter, margarine, mayonnaise
Jam with fruit pulps
Chocolate without nuts, fruits
Popcorn
Name _________________________ Venue Tower B, Level 2 (B25), Diagnostic Radiology Appointment Date _________________________ Appointment Time _________________________ Examination Fee _________________________ *If you are unable to keep the appointment, kindly call 6602 2700 (office hours) to inform us two working days before appointment and request for a new date.
DDR.PE.12.0225