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Lantheus Medical Imaging, Inc.

Lantheus Medical Imaging is a worldwide leader in medical imaging, with headquarters in North Billerica, Massachusetts, and nearly 700 employees worldwide with offices in Puerto Rico, Canada, and Australia.
The product portfolio includes ABLAVAR™ (gadofosveset trisodium) a blood pool contrast agent for magnetic resonance angiography MRA, Cardiolite® (Kit for the preparation of Technetium Tc99m Sestamibi), a cardiac perfusion imaging agent and DEFINITY® Vial for (Perflutren Lipid Microsphere) injectable suspension, the leading cardiac ultrasound contrast agent in the US.

Product Information

Contact Information
MAIL Lantheus Medical Imaging
Bldg. 200-2, 331 Treble Cove Rd.
N. Billerica, MA 01862
PHONE +1-800-362-2668
FAX +1-978-436-7501

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Larmor Equation
The Larmor equation is important because it is the frequency at which the nucleus will absorb energy. The absorption of that energy will cause the proton to alter its alignment and ranges from 1-100 MHz in MRI. The equation states that the frequency of precession of the nuclear magnetic moment is directly proportional to the product of the magnetic field strength (B0) and the gyromagnetic ratio (g). This is stated mathematically as w= gB0.

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Further Reading:
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Electron and proton gyromagnetic ratios
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Larmor Frequency
The Larmor precession frequency is the rate of precession of a spin packet under the influence of a magnetic field. The frequency of an RF signal, which will cause a change in the nucleus spin energy level, is given by the Larmor equation. The frequency is determined by the gyro magnetic ratio of atoms and the strength of the magnetic field. The gyromagnetic ratio is different for each nucleus of different atoms.
The stronger the magnetic field, the higher the precessional frequency. If an RF pulse at the Larmor frequency is applied to the nucleus of an atom, the protons will alter their alignment from the direction of the main magnetic field to the direction opposite the main magnetic field. As the proton tries to realign with the main magnetic field, it will emit energy at the Larmor frequency. By varying the magnetic field across the body with a magnetic field gradient, the corresponding variation of the Larmor frequency can be used to encode the position. For protons (hydrogen nuclei), the Larmor frequency is 42.58 MHz/Tesla.
See also Larmor Equation.

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Further Reading:
Magnetic resonance imaging
Dealing with Increased MRI Field Strength
Tuesday, 1 October 2013   by    
  News & More:
Magnetic resonance-guided motorized transcranial ultrasound system for blood-brain barrier permeabilization along arbitrary trajectories in rodents
Thursday, 24 December 2015   by    
Laser Induced Thermo TherapyMRI Resource Directory:
 - MR Guided Interventions -
(LITT) Laser induced thermo therapy is a therapeutically destruction of tumor or metastasis tissue with a thermolaser. Malignant tissue reacts very sensitive to heat. The heating of the malignant tissue results in a degeneration or coagulation and the death of the malignant cells by temperatures from 45°C to 99°C.
Induced thermal damage can be variable and unpredictable due to thermally induced changes in tissue thermal and blood perfusion. The affection can be controlled by thermo sensitive MRI sequences. The temperature can be monitored during the procedure and MR imaging following the procedure shows how effectively the tumor is damaged.
Further Reading:
4.6. MR-guided laser induced thermotherapy of osteiod osteoma
2002   by    
Physics of MRI Safety
Fast T2 weighted imaging by PSIF at 0.2T for interventional MRI.(.pdf)
  News & More:
MRI-guided SLA surgery proves safe and shows adequate efficacy for seizure control
Monday, 9 December 2013   by    
UCLA chemists use MRI to peek at temperatures of gases inside catalytic reactors
Thursday, 24 October 2013   by    
Laser Surgical Planning With Magnetic Resonance Imaging–Based 3-Dimensional Reconstructions for Intralesional Nd:YAG Laser Therapy of a Venous Malformation of the Neck
In MRI, the magnetic and thermal environment through that nuclei exchange energy in longitudinal (T1) relaxation.

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Further Reading:
Measuring T1 and T2 Relaxation - Introductory NMR & MRI from Magritek
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