PMC:3945237 / 13977-15375 JSONTXT

{"project":"2_test","denotations":[{"id":"24778812-3875700-24198591","span":{"begin":92,"end":94},"obj":"3875700"},{"id":"24778812-7326619-24198592","span":{"begin":611,"end":613},"obj":"7326619"},{"id":"24778812-9259251-24198593","span":{"begin":893,"end":895},"obj":"9259251"},{"id":"24778812-8930724-24198594","span":{"begin":1203,"end":1205},"obj":"8930724"}],"text":"Planar scintigraphy\nCollier reported a sensitivity of 55% with planar radionuclide imaging [12]. Initially, uptake is decreased in the perfusion and static phases, which represents the early ischemic event. Later, uptake is decreased within the femoral head in the perfusion phase and increased around the cold region in the static phase. The latter represents the reactive zone around the infarcted segment. The increased uptake from the reparative zone eventually replaces the photopenic region.Hungerford reported false-negative bone scans in the hips of 14 of 27 patients, 13 of whom had bilateral disease [16]. In patients with bilateral involvement, the uptake, although symmetric, really is increased bilaterally.\nBone scintigraphy equipped with a pinhole collimator has greater sensitivity for diagnosing AVN than bone scintigraphy using a high-resolution parallel-hole collimator [17,18]. The image obtained is magnified, allowing better visualization of small structures and improving detection of scintigraphic abnormalities.\nPlanar scintigraphic imaging using quantitative bone scan is a technique that provides physiologic data that cannot be obtained with other modalities, including MRI [19]. It allows quantification of uptake in the perfusion and static phases. It requires correct computer programming This technique is experimental and is not used widely in the clinical setting."}