MRI and CT Radiology

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MRI and CT Radiology

This page will helpful to Medical team ,Especially to radiology technologist and the radiologist and all medical person about radiology .

25/11/2025

The C7 nerve root is one of the most clinically important cervical roots. It controls motor strength, sensation, and reflexes of specific areas in the upper limb.

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🧠 1. Motor Function (Muscle Control)

C7 mainly controls elbow extension and wrist/finger extension.

Key muscles supplied
• Triceps brachii → Elbow extension (most important)
• Wrist extensors → Wrist extension
• Finger extensors → Finger opening / extension
• Pronator teres (partially) → Forearm pronation

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🖐 2. Sensory Function (Skin Sensation)

C7 supplies sensation to the middle hand region:
• Middle finger (most classic area)
• Part of index + ring finger
• Dorsal hand central area

This is why C7 radiculopathy = middle finger numbness/tingling.

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🔁 3. Reflex Associated

Triceps reflex
• Weak or absent in C7 nerve root compression.

💉 4. Common Clinical Problems With C7 Root

C7 Radiculopathy

Usually from:
• C6–C7 disc herniation
• Foraminal stenosis

Typical symptoms
• Pain radiating down posterior arm → back of forearm → middle finger
• Weakness of triceps (difficulty pushing, doing push-ups)
• Weak wrist extension (wrist “drops”)
• Reduced triceps reflex

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🦴 5. Easy Infographic Summary (Text Version)

C7 Nerve Root
Motor:
➡️ Triceps (elbow extension)
➡️ Wrist extensor
➡️ Finger extensor

Sensory:
➡️ Middle finger

Reflex:
➡️ Triceps reflex

Clinical:
➡️ C7 = “Middle finger radiculopat

13/11/2025

MRI-Guided Cryoablation
MRI-guided cryoablation is a minimally invasive, nonsurgical procedure that uses extreme cold to destroy abnormal tissue, such as cancerous or noncancerous tumors, while protecting surrounding healthy tissue.
The "machine" involved is a combination of:
A Cryoablation System: This system delivers a freezing agent (typically argon gas) through thin, specialized needles called cryoprobes inserted into the target tissue. The freezing agent circulates within the probe to create an "ice ball" that destroys the tissue by freezing it. A different gas, like helium, is then used for the thaw cycle. One commercial example is the Visual ICE™ MRI Cryoablation System.
A Magnetic Resonance Imaging (MRI) Machine: This provides high-resolution, real-time imaging during the procedure. This is the crucial guidance mechanism.
How MRI Guidance Works
The use of MRI is a significant advantage over other imaging techniques (like CT or ultrasound) because it offers:
Superior Soft-Tissue Contrast: This allows for clear visualization of the tumor and adjacent critical structures.
Real-Time Monitoring: The formation of the lethal ice ball is visible on the MRI screen as a dark area (a signal void). This allows the interventional radiologist to precisely monitor the size and shape of the ice ball to ensure the entire tumor, plus a safety margin, is covered, while simultaneously sparing nearby structures like nerves or blood vessels.
Radiation-Free Imaging: Unlike CT guidance, MRI-guidance does not expose the patient to ionizing radiation.
Key Applications
MRI-guided cryoablation is used by interventional radiologists as an alternative to surgery for localized tumors in various parts of the body, including:
Kidney (small renal tumors)
Liver
Lung
Prostate
Bone
The procedure is particularly beneficial for treating tumors that are close to critical structures.
This video explains the procedure of freezing kidney tumors, a common application for this technology: Renal Cryoablation: Interventional Radiology Procedure Explained.

11/11/2025

MRI Signa Hero3Tesla First edition in Cambodia .

09/11/2025

The Cruciate Ligaments: ACL and PCL

Both ACL (Anterior Cruciate Ligament) and PCL (Posterior Cruciate Ligament) are key stabilizing ligaments inside the knee joint. They cross each other in the center of the knee (hence the term “cruciate”), forming an “X” shape.

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⚙️ 1. ACL – Anterior Cruciate Ligament

Main Function:
• Prevents the tibia (shin bone) from sliding forward relative to the femur (thigh bone).
• Provides rotational stability to the knee during activities like pivoting, twisting, or changing direction.

Injury Example:
• Common in sports (e.g., football, basketball) when the knee twists while the foot is planted.
• Often results in instability or a “giving way” feeling.

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⚙️ 2. PCL – Posterior Cruciate Ligament

Main Function:
• Prevents the tibia from sliding backward relative to the femur.
• Works especially when the knee is bent (flexed), such as in walking downhill or descending stairs.

Injury Example:
• Often caused by a direct blow to the front of the tibia (e.g., dashboard injury in a car crash).

08/11/2025

World Radiography Day 2025: Honoring Tradition

We commemorate 130 years of medical imaging innovation, discovery, and commitment on November 8th, which is World Radiography Day 2025. Wilhelm Conrad Roentgen's discovery of X-rays, which revolutionized modern medicine and continues to save millions of lives annually, is celebrated on this day.

21/10/2025

MRA Brain to figure out the aneurysm

14/10/2025

Clinical Use in Knee MRI

T2 Mapping is mainly used to:
• Detect early cartilage degeneration before visible defects appear on routine MRI (e.g., PD or T2-weighted images).
• Monitor cartilage repair or regeneration after surgery (e.g., microfracture, autologous chondrocyte implantation).
• Assess osteoarthritis progression.
• Provide quantitative data for research or follow-up.

12/10/2025

MRI Fistula
1. Excellent Soft Tissue Contrast
• MRI provides high-resolution images that clearly show the relationship between the fistula tract, sphincter muscles, and adjacent structures.
• It helps differentiate active inflammation, abscess, and fibrosis.

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📍 2. Accurate Identification of Fistula Tract
• MRI can locate the internal and external openings of the fistula.
• It accurately shows the course and branching of the fistulous tract (e.g., intersphincteric, transsphincteric, suprasphincteric, or extrasphincteric).

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⚙️ 3. Helps in Surgical Planning
• Provides a road map for surgeons to perform appropriate fistulotomy or seton placement.
• Reduces the risk of recurrence by identifying secondary tracts and abscesses that might be missed clinically.

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🔍 4. Detects Hidden (Occult) Tracts and Abscesses
• MRI can reveal deep extensions or hidden abscesses not palpable or visible on examination.
• Important for complex or recurrent fistulas.

07/10/2025

1. High Image Resolution & Precision
• It supports very high spatial resolution — up to 24 line pairs per cm at 0% MTF.
• Uses a large 1024×1024 reconstruction matrix, which allows finer detail in the images (compared to the more common 512×512).
• Isotropic High Definition (iHD) imaging, which means uniform resolution in all directions; very helpful for small features and multiplanar reconstructions.
2. Advanced Detector & Sampling Technology
• The Micro-STAR detector has improved sensitivity, reduced electronic noise, greater dose efficiency and more stable performance.
• Quad-Sampling technology: by dynamically moving the focal spot both axially and longitudinally, the sampling density is increased ~400%. This helps reduce artifacts, improve resolution, and extend effective scanning coverage.
3. Dose Reduction & Safety Features
• Iterative reconstruction algorithms (Neusoft calls theirs ClearView, ClearInfinity, etc.) help reduce radiation noise, letting you get acceptable image quality at lower dose.
• “Organ Safe” features that reduce radiation to radiosensitive organs (eyes, thyroid, breasts) during scanning.
• Permits lower kV scanning (80, 100, 120, 140 kV) allowing better dose optimization depending on patient size or clinical task.
4. Cardiac Imaging Capabilities
• Algorithms for reducing motion artifacts in cardiac imaging (CMC – Coronary Motion Artifact Clear) improve clarity for coronary vessels.
• Ability to handle arrhythmias by detecting irregular heart beats and adjusting exposure or data collection accordingly, which helps reduce errors in cardiac studies.
5. Workflow & Patient/Operator Comfort
• The scanner has features like auto-patient positioning, an intuitive user interface, and improved workflow to make operations smoother.
• A relatively large gantry aperture (72 cm) gives more room, which is more comfortable for patients, especially large or claustrophobic ones.
• Faster rotation times (e.g. ~0.375 seconds) which means quicker scans, reducing motion artifacts and improving patient experience.
6. Cost & Value Strengths
• Neusoft promotes the NeuViz 128 as delivering high-end features (high resolution, cardiac imaging, etc.) with “value,” i.e. more features per cost, especially compared to some premium brands.

04/10/2025

NEUSOFT 1.5T CE MRA Renal and Non CEMRA MRA Renal.

09/09/2025

Diagnosis typically involves imaging with MRI of the sella turcica with contrast, hormone level testing, and visual field evaluation. Treatment depends on tumor size, function, and symptoms; small nonfunctioning microadenomas may only require monitoring, prolactinomas are often treated medically with dopamine agonists, and most symptomatic or large adenomas require surgical removal, commonly via a transsphenoidal endoscopic approach. Radiation therapy may be considered for recurrent or inoperable cases.

06/09/2025

Autoload CT injector is mordern types of CT loading normal saline and contrast more safely without air bubbles.

Address

Phume Kva, Dangkor, Community, Dangkor District
Phnom Penh
12401

Telephone

+85517348624

Website

http://camradiologytech.blogspot.com/

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