The bone scan carries most nuclear medicine departments. A practical walk through the patient journey, whole body against SPECT acquisition, the artefacts you will meet in the first month, and the kit list to start the service.
In most nuclear medicine departments in Bangladesh, the bone scan is the study that pays the electricity bill. Oncologists send prostate, breast and lung cases for staging and for follow-up. Orthopaedic surgeons send suspected stress fractures, painful prostheses and osteomyelitis. Rheumatologists send unexplained bone pain. It is high volume, it is forgiving of a department still learning, and it is usually the first study a new service should run in quantity before adding anything harder.
It is also the study where sloppy technique is most visible. A whole body sweep records the entire skeleton in one image, so a contaminated glove, a full bladder or a patient who shifted at the pelvis is on display in the report for the referring surgeon to see.
The uptake delay is what makes bone scanning operationally awkward and what makes it efficient once you organise around it. Tc-99m labelled diphosphonate binds to bone and clears from soft tissue through the kidneys, so image quality depends on giving the tracer time to clear before you scan.
Because the uptake delay does not occupy the camera, a department can inject a group in the morning and scan them in sequence in the afternoon. That is how volume is achieved. It also means the waiting area, the toilet and the injection room are as much a part of throughput as the camera is, and the toilet needs washable surfaces and a cleaning routine because it will be used by patients who have just been injected.
The standard survey is an anterior and posterior whole body scan with a low energy high resolution collimator and the energy window set on the 140 keV photopeak. On a dual head camera both views are acquired in one pass. Scan speed is the parameter that controls both image quality and list capacity: slower speeds give more counts per pixel and a cleaner image, faster speeds get through more patients. Speeds in the region of ten to fifteen centimetres per minute are widely used for adults, with a long rectangular matrix, but the number that matters is the one your own physicist arrives at after imaging a phantom on your camera with your collimators. Fix it, write it into a locked protocol, and stop letting each technologist choose.
Detector to patient distance controls resolution more than any acquisition setting. Use the automatic body contouring if the camera has it, and if it does not, teach the technologist to bring the heads down manually to the closest safe position and to check clearance at the shoulders and the feet before starting a sweep.
For suspected osteomyelitis, a painful prosthesis or a question of whether a lesion is active, a three phase study adds information that a delayed image alone cannot give. The flow phase is a rapid dynamic acquisition over the region of interest starting at the moment of injection, the blood pool phase is a static image immediately afterwards, and the delayed phase is the usual image at two to four hours. The camera has to be positioned and the acquisition armed before the injection, which means the injection happens on the couch rather than in the injection room. Departments that have never run a three phase study usually discover this the hard way, with the patient already injected in the wrong room.
Planar imaging superimposes the whole depth of the body onto one plane, which is exactly the problem in the spine and the pelvis, where posterior elements, vertebral bodies and facet joints overlap. SPECT separates them. SPECT of the lumbar spine changes the report in a meaningful proportion of cases where planar images are equivocal, and it is the single biggest quality improvement available to a department that already owns a rotating dual head camera and is not using it.
SPECT/CT goes further by adding anatomical localisation and attenuation correction, which is what converts a hot spot into a named structure. On a digital CZT system such as the VERITON-CT series, the detector arrangement is designed to collect counts from more directions than a conventional two head orbit, which is relevant for a bone department mainly because it shortens the SPECT acquisition to something you can add routinely to a busy list rather than reserving for special cases. A SPECT acquisition that takes too long simply does not get done.
| Area | What is needed | Notes for Bangladesh |
|---|---|---|
| Hot lab | Mo-99 or Tc-99m generator, shielded workstation with lead glass, dose calibrator, syringe and vial shields, lead pots, tongs | Generator delivery schedule sets the weekly list. Plan injecting days around it rather than the other way round. |
| Radiopharmacy quality | Thin layer chromatography materials and a counting method for radiochemical purity | Poor labelling shows as soft tissue and thyroid or stomach uptake. Check on every new kit lot, not occasionally. |
| Camera | Dual head gamma camera or SPECT/CT with whole body scan capability and a low energy high resolution collimator pair | Whole body scanning needs the couch travel and the room length. Confirm room dimensions against the sweep length, not the gantry footprint. |
| Power | Online double conversion UPS with runtime covering a full whole body sweep plus a controlled shutdown, and a voltage stabiliser ahead of it | Load shedding and generator changeover transients ruin acquisitions and shorten electronics life. Size the UPS for the sweep, not for a graceful three minute shutdown. |
| Environment | Air conditioning sized with redundancy, humidity control, dust filtration | A room that swings from cool to hot overnight is how sodium iodide crystals and electronics fail early. |
| Radiation safety | Survey meter, contamination monitor, personal dosimetry, spill kit, decay store for waste, designated areas and local rules | BAERA licensing expects a named radiation safety officer and documented local rules before the source arrives. |
| Quality control | Flood, resolution and distortion phantoms and a SPECT phantom, with a written schedule | Leeds Test Objects gamma flood, resolution and distortion phantoms and the SPECT IQ phantom cover the routine set. |
| Reporting | Workstation with the processing package licensed, DICOM export to PACS, a written report template | Confirm at tender stage which processing packages are licensed. Assuming they are included is a common and expensive mistake. |
A bone scan report that says increased uptake at L3 is not useful to the surgeon who sent the patient. The report needs to answer the question that was asked, state whether the pattern is metastatic, degenerative or traumatic, and say plainly what correlation is needed. That requires the reader to have the plain films or the CT available, which in turn requires the department to be connected to the hospital's imaging archive rather than working from a printed film the patient brought in an envelope.
Two habits build referral volume faster than any marketing. Report within a defined turnaround and publish it, so clinicians can plan clinics around it. And keep prior studies retrievable, because the comparison with a scan from eight months ago is often the whole value of the second scan. Departments that cannot find their own priors lose the follow-up work to whoever can.