US & MRI

Ultrasound (US)

A medical imaging technique that uses acoustical energy above the audible frequency to produce images.

Probes in Ultrasound

Devices that produce and record ultrasonic signals for imaging.

PACS system

A system for digitally storing images from ultrasound and other imaging modalities.

Advantages of Ultrasound

Relatively inexpensive, widely available, portable, and safe for pregnant women and children.

Disadvantages of Ultrasound

Cannot penetrate bones, disrupted by gas-filled structures, and dependent on the operator.

First choice imaging for female pelvis

Ultrasound is primarily used for imaging the female pelvis and pediatric patients.

Cystic vs Solid

Ultrasound helps differentiate between cystic and solid masses.

Non-invasive vascular imaging

Ultrasound is utilized for imaging of vascular structures without invasive procedures.

Common uses of Ultrasound

Used for assessing breast masses, thyroid nodules, tendons, and imaging the brain, hips, and spine in newborns.

Magnetic Resonance Imaging (MRI)

An imaging technique that uses strong magnetic fields and radio waves to visualize the internal structure of the body.

Hydrogen atoms in MRI

The primary elements manipulated in MRI to produce images, primarily those in water.

Gadolinium in MRI

A contrast agent used to enhance the detection of lesions like tumors or abscesses.

MRI image characteristics

Bone appears black, while fluid appears white in MRI images.

Advantages of MRI

No ionizing radiation, superior soft tissue contrast, and capability to evaluate blood flow and organ motion.

MRI imaging capabilities

Can produce high-resolution images in any projection without moving the patient.

Disadvantages of MRI

Limited availability, high costs, safety issues from strong magnetic fields, and potential side effects from contrast media.

Neurologic imaging

MRI is particularly sensitive in imaging neurological structures and soft tissues such as muscles and ligaments.

Ionizing radiation

Type of radiation that is not used in MRI, making it safer for patients.

Real-time image-guided procedures

Ultrasound allows for real-time imaging during fluid aspirations and biopsies.

Operator-dependent imaging

The quality of ultrasound images can vary based on the skill of the operator.

Hydrophobic properties in MRI

MRI can differentiate tissues based on their biochemical properties like water and fat content.

MRI for stroke detection

MRI protocols can assess blood velocity and water diffusion, aiding in stroke detection.

Soft tissue resolution in MRI

MRI provides superior resolution in differentiating soft tissues compared to CT scans.

Contrast between MRI and CT

MRI can better distinguish between various types of soft tissues.

MRI and Calcium

Calcium does not emit a signal on MRI, allowing imaging of areas surrounded by bone.

Fluid imaging in MRI

MRI effectively visualizes fluid, important for assessing pathologies.

Imaging women in child-bearing age

Ultrasound is particularly useful for imaging during pregnancy.

Limitations of ultrasound in certain scenarios

Ultrasound may struggle to visualize structures in obese patients or around large gas-filled areas.

Applications of ultrasound in pediatrics

Commonly used for imaging pediatric patients due to its non-invasive nature.

3D images in MRI

MRI can generate three-dimensional imaging of bodily structures.

Safety concerns in MRI

Patients may experience safety issues due to strong magnetic fields.

Blood flow evaluation in MRI

MRI can evaluate the flow of blood vessels and cerebrospinal fluid.

Imaging foetus during pregnancy

Ultrasound is commonly used to visualize the fetus and placenta.

Comparison of ultrasound and MRI cost

MRI is generally more expensive than ultrasound due to equipment and operational costs.

Digital storage in medical imaging

Images from ultrasound can be easily recorded and stored digitally using PACS.

Imaging soft tissues with MRI

MRI is particularly effective for imaging soft tissues like tendons and ligaments.