MRI and CT Radiology

18/02/2026

Focusing on Multiple Sclerosis (MS) and Epilepsy highlights why the "3D" aspect of Cube is such a game-changer. These conditions often hide in the "nooks and crannies" of the brain that standard scans might overlook.
​1. Multiple Sclerosis (MS)
​In MS, the goal is to find "plaques" (areas of inflammation or scarring). 3D FLAIR Cube is the gold standard for this for two main reasons:
​Juxtacortical Lesions: These are tiny spots located right at the boundary between the gray matter and white matter. In 2D scans, these often get "blurred" into the surrounding tissue. Cube’s sub-millimeter thinness makes these spots pop.
​Lesion Load Tracking: Because there are no gaps between slices, doctors can more accurately calculate the total volume of all lesions. This is crucial for seeing if a medication is actually working or if the disease is progressing.
​2. Epilepsy
​For patients with seizures, the culprit is often Focal Cortical Dysplasia (FCD)—a tiny area where the brain didn't form quite right.
​Finding the "Needle in the Haystack": FCD can be incredibly subtle. 3D Cube allows radiologists to "scroll" through the brain in the coronal plane (front to back) and the axial plane (top to bottom) simultaneously.
​Curving the Image: Specialized software can take the 3D Cube data and "unfold" the curves of the brain (cortical reconstruction). This allows doctors to see if the thickness of the brain's "crust" (the cortex) is abnormal, which is a major red flag for epilepsy.

17/02/2026

MRI Whole Spine Screening

16/02/2026

16/02/2026

BONE Expansile Lesion

08/02/2026

CT Calcium Scoring (Coronary Artery Calcium Score – CAC) is used to measure the amount of calcified plaque in the coronary arteries. In simple words 👉 it helps predict future heart attack risk before symptoms appear.

Here’s a clear, practical breakdown 👇

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What CT Calcium Scoring is used for ❤️

1. Assess risk of coronary artery disease (CAD)
• Detects early atherosclerosis
• Even when:
• Patient has no chest pain
• ECG & stress test are normal

👉 Calcium = plaque = higher heart risk

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2. Predict future heart attack & stroke risk
• Strong predictor of:
• Myocardial infarction
• Major adverse cardiac events (MACE)

📌 The higher the score → the higher the risk

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3. Guide preventive treatment

Helps doctors decide:
• Start statins or not
• Intensify lifestyle changes
• Need for closer cardiac follow-up

Especially useful for:
• Borderline or intermediate-risk patients

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4. Risk stratification in asymptomatic patients

Ideal for people:
• Age 40–75
• With risk factors:
• Diabetes
• Hypertension
• Smoking
• Family history of heart disease
• High cholesterol

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5. Motivate patient behavior change

Seeing a high calcium score often pushes patients to:
• Quit smoking
• Exercise regularly
• Control diet & weight
• Adhere to medications

07/02/2026

01/02/2026

In the world of MRI, FLAIR (Fluid Attenuated Inversion Recovery) is often considered the "bread and butter" of neuroimaging. As a tech, if I see a brain order, I’m almost certainly running a FLAIR.

Here is a technical and clinical breakdown of why this sequence is so vital.

1. The Core Mechanism: "Nulling" the Water
The "magic" of FLAIR is in its name: Fluid Attenuation. In a standard T2-weighted image, CSF (cerebrospinal fluid) is bright white. Because many brain pathologies (like strokes or MS plaques) are also bright on T2, they can "hide" next to the bright CSF in the ventricles or sulci.

How it works: We apply an initial 180
∘
inversion pulse. We then wait for a specific amount of time—called the Inversion Time (TI)—until the signal from the moving water (CSF) reaches the "null point" (zero signal).

The Result: The CSF turns pitch black, while the rest of the T2-weighted tissue properties remain bright. This makes abnormalities "pop" against the dark background.

2. Clinical Applications
FLAIR is the most sensitive sequence for detecting subtle lesions near the fluid-filled spaces of the brain.

Multiple Sclerosis (MS): It is the gold standard for seeing Dawson’s Fingers (periventricular lesions). Without FLAIR, these white spots would blend into the white CSF of the ventricles.

Subarachnoid Hemorrhage (SAH): FLAIR is incredibly sensitive to blood in the sulci. If there is acute bleeding, the normally black CSF spaces will appear bright or "dirty."

Infarction (Stroke): While DWI is faster, FLAIR shows us when a stroke has "matured." If a stroke is visible on DWI but not on FLAIR, it’s often within the thrombolysis window (less than 4.5 hours old).

Cortical Dysplasia: In epilepsy cases, FLAIR helps us find subtle thickening or blurring of the grey-white matter interface.

3. Advantages vs. Limitations
Advantages

High Contrast: Exceptional contrast-to-noise ratio for edema and inflammation.

Lesion Conspicuity: You don't have to squint to find a lesion; the dark CSF background does the work for you.

Versatility: It can be acquired in 2D or 3D (which allows for reconstructed views in any plane).

Limitations

Flow Artifacts: Sometimes, slowly moving CSF (especially in the posterior fossa) doesn't null perfectly, creating "fake" bright spots that can look like disease.

Scan Time: Because of the long Inversion Time (TI), FLAIR is one of the longer sequences in a protocol (usually 4–6 minutes).

Supplemental Oxygen: If a patient is on high-flow oxygen, it can sometimes change the signal in the sulci, mimicking a hemorrhage.

4. Quick Tech Specs
If you were looking at the scanner console, a typical 3T Brain FLAIR looks like this:

TR (Repetition Time): Very Long (~9,000 ms)

TE (Echo Time): Long (~120 ms)

TI (Inversion Time): ~2,500 ms (This is what kills the CSF signal)
:

28/01/2026

CT Perfusion or MR Perfusion

28/01/2026

Difference between imaging modality and advantage

25/01/2026

🧠 MRI vs. CT Scan: Comparison Table

Feature MRI (Magnetic Resonance Imaging) CT Scan (Computed Tomography)
Technology Used Magnetic fields & radio waves X-rays
Best For Soft tissues: brain, spinal cord, muscles, ligaments Bones, lungs, abdomen, trauma cases
Radiation Exposure ❌ None ✅ Yes (ionizing radiation)
Image Detail ✅ High for soft tissues ✅ High for bones and dense structures
Scan Speed ❌ Slower (15–60 minutes) ✅ Fast (5–10 minutes)
Cost ❌ More expensive ✅ Generally cheaper
Availability ❌ Less common in rural/low-resource settings ✅ Widely available
Noise & Comfort ❌ Loud, enclosed space (may cause claustrophobia) ✅ Quieter, more open
Metal Compatibility ❌ Unsafe for patients with metal implants or pacemakers ✅ Safe with most implants
Motion Sensitivity ❌ Sensitive to movement (can blur images) ✅ Less sensitive

24/01/2026

🧩 Visual Interpretation Tips

• Bright CSF in ventricles and sulci confirms T2-weighting.
• Dark white matter and brighter gray matter help distinguish cortical structures.
• Hyperintense lesions may indicate pathology—correlate with clinical history.

24/01/2026

🧠 T2-Weighted MRI Sequence: Characterization & Clinical Use

🎯 Key Characteristics

• Contrast Basis: T2-weighted images emphasize differences in T2 relaxation times, showing how quickly transverse magnetization decays.
• Appearance:• Fluid (e.g., CSF): Bright/Hyperintense
• Fat & White Matter: Intermediate to dark
• Pathology (e.g., edema, tumors): Often bright

• Pulse Sequence: Typically uses Spin Echo (SE) or Fast Spin Echo (FSE/TSE) techniques.

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🩺 Clinical Applications

Condition T2WI Utility
Stroke Detects edema and infarct zones
Tumors Highlights mass effect and surrounding edema
Multiple Sclerosis Shows demyelinating plaques
Infections Identifies abscesses and inflammation
Hydrocephalus Visualizes enlarged ventricles
Trauma Reveals hemorrhage and soft tissue injury

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⚙️ Typical Imaging Parameters

Parameter Value Range Notes
TR (Repetition Time) 2000–6000 ms Long TR to allow full T2 contrast
TE (Echo Time) 80–120 ms Long TE enhances fluid brightness
Slice Thickness 3–5 mm Balances resolution and coverage
Matrix Size 256×256 or higher Ensures fine anatomical detail
FOV (Field of View) 22–26 cm Covers entire brain region -tech - CT radiology #