ABOUT BONE SCINTIGRAPHY MURALI : ABOUT BONE SCINTIGRAPHY MURALI This topic briefly describes about the scintiscanning of
the bone in the nuclear medicine department Introduction : Introduction Skeletal scintigraphy is performed by injecting a bone seeking radioactive tracer with the aid of gamma camera.
More sensitive than conventional X-ray procedure. Topics For Discussion : Topics For Discussion Radio active tracer or Radiopharmaceuticals and affinity
Indications for bone scan
Imaging Techniques-Planar & Spect
Conclusion Radiopharmaceuticals : Radiopharmaceuticals Technetium(99mTc) a gamma ray emitting radionuclide is labelled with phosphate or phosphonate(MDP,HDP) which has affinity to bone
Intravenous injection,dose Adults (15-25mCi). Children's depends on weight&age
Imaging time 2- 3 hours delayed after I.V Pt.Preparation : Pt.Preparation No restrictions to eat,drink or to drive.
Intake of more fluid after Injection
Frequent voiding is advised
Instruct about the procedure to the patient
Remove all the external metallic objects and prosthesis before to scan Indications : Indications Rule out of bony metastases, staging ,Pre & Post palliative, chemo and radio therapy.
Avascular necrosis,Infection and Inflammation,micro fracture, bonegraft perfusion,biopsy site.
Metabolic bone disease,arthritis, gout Imaging Techniques-Planar & Spect : Imaging Techniques-Planar & Spect Gamma Camera fitted with High Resolution collimator
Whole body imaging : Scan speed = 11 cm/min
Spot views : Time mode: 5 min & in count mode : 600kcts
Blood pool image at 5 min post injection is acquired to r/o infection.
Gamma camera rotates clockwise or counter in order to obtain 3D images. The information acquired from each projection is translated in to images by suitable processing methods.
Time mode : 30 sec/projection Slide 8: ARTHRITIS METASTATES PAGETS NORMAL Radiation Dosimetry : Radiation Dosimetry Estimated Absorbed Radiation Doses(MIRD) ADULT Conclusion : Conclusion Sensitivity is more but Specificity is less
Radiation dose is less when compare to X-rays.
Contra indication unknown except pregnancy
No Adverse reactions but there is a least chance for hypersensitivity reactions