DEXA Radiation Safety & Patient Preparation — Questions and Answers
Question 1: What is ALARA in radiation safety?
- Average Level of Radiation Application
- As Low As Reasonably Achievable (Correct answer)
- Annual Limits of Radiation Amount
- All Lines Are Radiation Approved
Correct answer: As Low As Reasonably Achievable
ALARA stands for "As Low As Reasonably Achievable" and is a fundamental principle in radiation safety. It mandates that all radiation exposure should be kept to the absolute minimum necessary, taking into account economic and social factors. This principle guides practices in DEXA scanning to minimize patient and staff exposure while still achieving diagnostic quality images.
Question 2: What should patients remove before a DEXA scan?
- Shoes
- All metal objects (Correct answer)
- Hair accessories
- Shirt
Correct answer: All metal objects
Patients should remove all metal objects, such as jewelry, zippers, buttons, and buckles, before a DEXA scan. Metal objects can create artifacts on the scan image by attenuating the X-ray beam, leading to inaccurate bone mineral density measurements. Removing them ensures a clear image and reliable results.
Question 3: Which patients need extra precaution during a scan?
- Children
- Pregnant patients (Correct answer)
- Elderly
- Smokers
Correct answer: Pregnant patients
Pregnant patients require extra precaution during any procedure involving radiation, including DEXA scans. Although DEXA uses a very low dose of radiation, there is still a potential risk to the developing fetus. Therefore, pregnancy should always be screened for, and the scan should typically be postponed or performed only if absolutely medically necessary and with appropriate shielding after consultation with a radiologist.
Question 4: What is a potential side effect of radiation exposure?
- Fever
- Dehydration
- Increased cancer risk (Correct answer)
- Muscle strain
Correct answer: Increased cancer risk
While DEXA scans use a very low dose of radiation, any exposure to ionizing radiation carries a small, cumulative risk of cellular damage that can potentially lead to an increased risk of cancer over a lifetime. This is why radiation safety principles like ALARA are strictly followed to minimize exposure for both patients and staff.
Question 5: Which shielding device is used in radiation safety?
- Cotton vest
- Plastic sheet
- Lead apron (Correct answer)
- Metal helmet
Correct answer: Lead apron
A lead apron is a common shielding device used in radiation safety to protect sensitive body parts from unnecessary radiation exposure. Lead is highly effective at absorbing X-rays. While not typically worn by patients during a DEXA scan due to the very low dose and specific beam geometry, lead shielding may be used for staff or in specific situations to protect areas not being scanned.
Question 6: Why assess patient history before a DEXA scan?
- Schedule follow-ups
- Estimate scan cost
- Check for conflicting tests or conditions (Correct answer)
- Choose scan duration
Correct answer: Check for conflicting tests or conditions
Assessing a patient's medical history before a DEXA scan is crucial to identify any conflicting tests or conditions that could affect the scan's accuracy or safety. For example, recent nuclear medicine scans or the presence of metal implants can interfere with results, and pregnancy is a contraindication. This step ensures the scan is appropriate and yields reliable data.
Question 7: What is the typical radiation dose in a DEXA scan?
- High
- Moderate
- Very high
- Low (Correct answer)
Correct answer: Low
DEXA scans utilize a very low dose of ionizing radiation, significantly less than a standard chest X-ray. This low dose makes it a safe and effective tool for monitoring bone mineral density, with the benefits of early detection and management of osteoporosis far outweighing the minimal radiation risk.
Question 8: What’s the technician's role in radiation safety?
- Handwriting reports
- Scanning receipts
- Calling doctors
- Proper positioning and following protocols (Correct answer)
Correct answer: Proper positioning and following protocols
The technician plays a critical role in radiation safety by ensuring proper patient positioning and strictly adhering to established scanning protocols. Correct positioning minimizes the area exposed to radiation and prevents the need for repeat scans, while following protocols ensures the lowest possible dose is used to achieve diagnostic quality images, aligning with the ALARA principle.
Question 9: What should be done if a patient is pregnant?
- Cancel immediately
- Notify radiologist (Correct answer)
- Continue as usual
- Double scan
Correct answer: Notify radiologist
If a patient is pregnant or suspected of being pregnant, the radiologist must be immediately notified. DEXA scans involve ionizing radiation, which poses a risk to the developing fetus. The radiologist will then determine if the scan can be postponed, if alternative imaging is necessary, or if the benefits outweigh the risks with appropriate precautions.
DEXA Radiation Safety & Patient Preparation
What is ALARA in radiation safety?