Written By: IJCP Editorial Team

Published On: 14 Dec, 2022 4:14 PM | Updated On: 15 May, 2024 3:01 PM

X-Ray: Imaging Tests For Clinical Diagnosis

X-rays are a type of electromagnetic wave radiation used in medical imaging procedures to examine the human body's internal structures. It is a quick, painless test wherein X-ray beams passed through the body give an image output that is studied for clinical investigations. In this procedure, an x-ray beam is passed through the body by an x-ray machine. The x-ray striking the internal structures is either absorbed or scattered in different amounts. The undeflected x-rays are transmitted to a detector and processed to generate an image on a film or computer screen. The rate of absorbency of the radiation varies for different body parts depending on the density. Dense materials like bones appear white as calcium absorbs the maximum x-rays. Soft tissues and fat absorb less and thus appear gray. Air absorbs the least, generating a black image on X-ray film or digital media.

Types of X-ray Studies

Though the basic principle is similar, medical imaging procedures are classified into several types, each employing a unique set of technologies and techniques, serving varied purposes. These include:

● Radiography: a single image for later analysis.

● Mammography: used for imaging the internal structures of the breasts.

● Fluoroscopy: allows for the real-time monitoring of surgery or the movement of a contrast agent (also known as a "dye") through the body by displaying continuous x-ray images on a monitor. It can result in comparatively significant radiation doses, particularly for complex interventional procedures (such as inserting stents or other devices inside the body) that call for prolonged fluoroscopy exposure.

● Computed Tomography: as the images are reconstructed from many individual x-ray projections, CT requires a higher radiation dose than conventional radiography.

Application of X-ray procedure 

Standard X-rays have a wide range of applications, such as detecting chest conditions like pneumonia, diagnosing tumors, and locating bone diseases or injuries. X-ray technology is also used in other diagnostic procedures, such as computed tomography (CT) scans, arteriograms, and fluoroscopy. An X-ray may be recommended for the following conditions:

• If the doctor suspects a fracture.

• To determine the cause of pain and swelling in certain body parts.

• To detect structural problems in bones, joints, or soft tissues.

• To carry out routine screenings for cancer and other diseases.

Advantages and Disadvantages of X-Rays

X-ray imaging tests are widely accepted as useful medical tools for various examinations and procedures. The wide acceptance depends on varied factors like: 

• It is non-invasive.

• It is a painless procedure.

• It aids in medical and surgical treatment planning.

• It guides medical professionals as they place stents, catheters, or other devices to treat tumors, remove blood clots, or clear other blockages.

• X-rays can be carried out safely on all ages, including infants.

However, there are certain risks associated with using X-rays:

• Excessive exposure to x-rays can lead to the development of cancer later in life

• It may cause cataracts and hair loss

• There is an increased possibility of adverse reactions to an intravenously injected contrast agent.

• If performed during pregnancy, it may have detrimental effects on the fetus.

In the balance of benefits and risks of using x-rays, it is crucial to consider the following factors:

• Younger patients are more susceptible to radiation; special precautions should be taken to limit radiation exposure to the pediatric population during all X-ray imaging exams.

• Due to the potential effects of radiation exposure on the developing fetus, special precautions should be taken when imaging pregnant patients.

• The benefit of detecting disease should be carefully weighed against the risks of imaging screening studies on healthy, asymptomatic patients.

• Some organs are more radiosensitive than others in the body.

• The risk of developing cancer from exposure to medical imaging radiation is generally very low, and it is dependent on the following:

1. Radiation dose - The higher the dose, the greater the lifetime risk of cancer.

2. Age of the patient - A patient who receives X-rays at a younger age has a higher lifetime risk of cancer than one who receives them at an older age.

3. Sex - Women are slightly at more risk of developing radiation-associated cancer than their male counterparts

Tips to prepare for an X-ray

• Upraise your healthcare provider about your medical history, allergies and medications, if any. 

• Inform the doctor if you're pregnant or breastfeeding.

• Wear comfortable or loose-fitting cloths 

• You may be asked to change into a gown before the X-ray' if necessary.

• For X-rays other than bone, you should:

• Avoid using products such as creams, lotions, or perfume.

• Remove metal objects like jewelry and hairpins as they may interfere with the imaging process

• Do not eat or drink several hours beforehand (for GI X-rays).