RD4.1-3 | Interdisciplinary Imaging Communication — Glossary

The dark band behind a strongly reflective/absorptive structure on ultrasound, characteristically seen posterior to gallstones, helping confirm them.

Evidence-based guidelines from the American College of Radiology that rank imaging options by clinical scenario to support appropriate, justified ordering.

Atomic Energy Regulatory Board — India's statutory radiation safety regulator under the Atomic Energy Act 1962; mandates that diagnostic ionising procedures be justified and optimised.

Whether a given imaging study is the correct test for the clinical question and is justified; clarified with the radiologist when in doubt and supported by referral guidance.

Continuous measurement of end-tidal carbon dioxide; mandatory monitoring for any ventilated patient during transport, providing early warning of tube displacement or circuit disconnection.

The graded priority of an imaging request (routine, urgent, emergent) communicated to drive correct scheduling; emergent requests warrant a direct telephone call to the radiologist.

A discordance between imaging severity and symptom severity — most striking in osteoarthritis, where a markedly abnormal X-ray may cause little pain and a near-normal film may accompany severe pain.

The disciplined integration of anatomy, pathophysiology and imaging findings with the patient's clinical picture to reach and communicate a diagnosis; an image is interpreted in context, never in isolation.

The requesting clinician's continuing responsibilities after the study: reading the full report, acting on critical findings, avoiding duplicate imaging, and re-clarifying when the report does not answer the question.

The first-line ultrasound technique for deep vein thrombosis; the cardinal sign is loss of compressibility — a thrombosed vein will not collapse under gentle probe pressure (a normal vein compresses fully).

The pathway by which a radiologist conveys an urgent or unexpected finding directly to a responsible clinician who must acknowledge and act on it.

A fibrin-degradation product; a negative high-sensitivity D-dimer with a low Wells probability can exclude DVT without imaging, whereas a positive result directs the patient to ultrasound.

Needless repetition of an imaging study already performed (often because prior images/reports were not retrieved); a common, costly and — for ionising studies — harmful failure to close the loop.

Estimated glomerular filtration rate; the renal-function value required before iodinated-contrast studies because contrast can precipitate contrast-associated acute kidney injury at low eGFR.

The risk that an iron-containing object (steel oxygen cylinder, scissors, standard monitor) is violently pulled into the MRI bore by the static field, capable of fatal injury.

Thickening of the gallbladder wall beyond 3 mm in a fasted, non-contracted gallbladder; an ultrasound sign of acute cholecystitis reflecting wall inflammation and oedema.

The clinical request for an imaging study; functions as a written consultation that gives the radiologist the history, specific question, urgency and safety information needed to protocol, prioritise, run and interpret the study.

Movement of a patient between locations within the hospital (e.g. ICU to radiology); for the critically ill it is a high-risk procedure requiring stabilisation, monitoring continuity, a trained escort and a pre-transport checklist.

Reduction of the radiolucent gap on X-ray that represents articular cartilage; in osteoarthritis it is characteristically asymmetric (the loaded compartment), reflecting focal cartilage loss.

The principle that every exposure to ionising radiation must do more good than harm; under AERB and ICRP, the requesting clinician shares responsibility for justifying each study.

The decision that the diagnostic benefit of moving a critically ill patient for imaging outweighs the risk of the journey, and that no adequate bedside alternative exists.

The four cardinal radiographic signs of osteoarthritis: Loss of joint space, Osteophytes, Subchondral Sclerosis, and Subchondral cysts.

Emergency rapid loss of the MRI superconducting magnetic field by boiling off the cryogen; reserved for situations such as a person pinned by a ferromagnetic object, as it disables the scanner and carries its own hazards.

The four controlled-access regions of an MRI facility: Zone I (public), Zone II (screening), Zone III (controlled, including control room), and Zone IV (the magnet/scanner room itself).

Equipment or an implant that is safe in the MRI environment under specified conditions (e.g. field strength, positioning); only such equipment may be taken into Zone IV.

Equipment or an object that is hazardous in the MRI environment (ferromagnetic) and must never enter the magnet room; standard cylinders, monitors, pumps and trolleys are MRI-unsafe.

A bony outgrowth at the joint margin formed by remodelling of cartilage and bone; one of the cardinal radiographic signs of osteoarthritis.

The calculated usable gas remaining in a portable cylinder (contents = gauge pressure x water capacity; usable minutes = litres / fresh-gas flow); must exceed the journey time plus a margin, with a spare carried.

Fluid collecting around the gallbladder seen on ultrasound; an inflammatory sign supporting acute cholecystitis.

A systematic ABCDE-style check completed before moving a critically ill patient, covering airway, breathing (including oxygen-cylinder reserve), circulation, drugs/equipment, documentation/destination, and escort.

The requesting clinician's working hypothesis included on the requisition so the radiologist can weigh alternatives and tailor interpretation.

The mandatory patient-safety information on a requisition: renal function (eGFR) for contrast, contrast-allergy history, pregnancy/LMP, implants/devices for MRI, and anticoagulation for procedures.

A structured communication framework — Situation, Background, Assessment, Recommendation/Request — adaptable to building a clear imaging requisition.

A structured communication format — Situation, Background, Assessment, Recommendation/Request — used to hand over a transported patient and ensure continuity of care on arrival and return.

Maximal tenderness elicited when the ultrasound transducer is pressed directly over the sonographically localised gallbladder; more specific for acute cholecystitis than the clinical Murphy sign.

The precise diagnostic question the study must answer (e.g. '?pulmonary embolism'), phrased as a question; it directs the radiologist's choice of modality, protocol and search pattern.

A lucent cavity (geode) in the subchondral bone in osteoarthritis, formed by synovial-fluid intrusion or microfracture through the damaged joint surface.

Increased density (whiteness) of bone immediately beneath the articular cartilage, from reactive new-bone formation in response to increased load in osteoarthritis.

A competent practitioner accompanying a transferred patient who can manage the airway and anticipated deterioration; acuity determines numbers (a ventilated patient needs a doctor plus an assistant).

The three factors predisposing to thrombosis — venous stasis, endothelial injury, and hypercoagulability — underlying the pathophysiology of deep vein thrombosis.

A validated clinical pre-test probability rule for deep vein thrombosis; combined with D-dimer it determines who requires compression ultrasonography.

The MRI magnet (scanner) room — the highest-hazard area, entered only after screening and only with MRI-conditional equipment; standard ferromagnetic equipment must never enter.