 fatigues suit Mr. Dafoe, whose Ã©lan in battle presents a fine counterpoint to Mr. Fordâs stolid nobility. Sequences like an urban assault on a C.I.A. caravan and the flavorful South American milieu are a welcome reprieve to the back-room Potomac intrigues.

The most effective sequence crosscuts between a funeral at Arlington National Cemetery and the military unit under fire. As the president offers a eulogy masking his misdeeds, martial drums segue into machine-gun fire, laying bare executive indifference to the sacrifices of men in uniform. When Ryan later confronts the president (Donald Moffat), it stings.

By 2002, when Paramount dusted off the franchise with âThe Sum of All Fears,â new demographic exigencies demanded a younger, single Ryan. In came Ben Affleck, humble, handsome but devoid of Mr. Baldwinâs charm and Mr. Fordâs gravity. And out went credibility: When an atomic device, planted by a neo-Nazi cabal, detonates at a football game in Baltimore, Russia and the United States play nuclear chicken â again.

While Mr. Affleckâs friend Matt Damon had the documentarylike stylings of the director Paul Greengrass for his Jason Bourne franchise, Mr. Affleck had only Phil Alden Robinson, whose passable direction is somewhat enhanced by the cinematographer John Lindleyâs facility with wintry landscapes and underlit interiors.

âThe Jack Ryan Collectionâ offers no extras beyond the original DVDsâ; it seems to exist to promote âJack Ryan: Shadow Recruit,â yet another reboot, out in 2014, in which Chris Pine thwarts, yes, Russian terrorists. In the Clancy books, Ryan eventually becomes president. Weâll see how far Mr. Pineâs Ryan gets.

BRUCE WEBER: THE FILM COLLECTION Four documentaries by this noted photographer, includingâLetâs Get Lostâ (1988), about the trumpeter Chet Baker. âChet Bakerâs face, and the extraordinary ways in which Bruce Weber has photographed it, encapsulate the story of Bakerâs life in a succession of ghostly, indelible images that are at once hauntingly beautiful and desperately sad,â Janet Maslin wrote in The New York Times in 1989. (New Video Group)

MATILDA Danny DeVitoâs 1996 adaptation of the Roald Dahl story about a girl (Mara Wilson) who loves reading â and who discovers her own supernatural abilities â has an American spin, but is still an endearing romp. âMr. DeVito brings out the merrily black comedyâ in the tale, Ms. Maslin wrote in The Times in 1996. (Sony Pictures)

GOOD OLâ FREDA Ryan Whiteâs documentary is an extended interview with Freda Kelly, the Beatlesâ longtime secretary, who doubled as the manager of their fan club. âThese recollections are, disappointingly, more coy than candid,â Jeanette Catsoulis wrote in The Times in September. (Magnolia)

CARMEN JONES Harry Belafonte, Pearl Bailey and, in the title role, Dorothy Dandridge star in Otto Premingerâs 1954 adaptation of the Broadway musical (itself an update of the Bizet opera, with new lyrics and an African-American cast). Dandridgeâs singing voice was dubbed by the mezzo-soprano Marilyn Horne; LeVern Hutcherson sang for Mr. Belafonte. (20th Century Fox Studio Classics)

THE BLUE ANGEL This 1930 Weimar classic â about a chanteuse (Marlene Dietrich) who drives a respected professor (Emil Jannings) to depths of self-humiliation â was the first of Josef von Sternbergâs collaborations with Dietrich. Kinoâs two-disc reissue includes Dietrichâs screen test, interview and concert footage of her, and the German- and English-language versions of the film (both shot simultaneously by Sternberg). (Kino Classics)
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âThe Jack Ryan Collection,â a four-disc set spanning his adventures, provides an object lesson in how, and how not, to manage a series.A human-computer interactive method for projected clustering

Clustering is a central task in data mining applications such as customer segmentation. High-dimensional data has always been a challenge for clustering algorithms because of the inherent sparsity of the points. Therefore, techniques have recently been proposed to find clusters in hidden subspaces of the data. However, since the behavior of the data can vary considerably in different subspaces, it is often difficult to define the notion of a cluster with the use of simple mathematical formalizations. The widely used practice of treating clustering as the exact problem of optimizing an arbitrarily chosen objective function can often lead to misleading results. In fact, the proper clustering definition may vary not only with the application and data set but also with the perceptions of the end user. This makes it difficult to separate the definition of the clustering problem from the perception of an end-user. We propose a system, which performs high-dimensional clustering by cooperation between the human and the computer. The complex task of cluster creation is accomplished through a combination of human intuition and the computational support provided by the computer. The result is a system, which leverages the best abilities of both the human and the computer for solving the clustering problem.Lung perfusion: MRI vs. SPECT for screening in suspected chronic thromboembolic pulmonary hypertension

Purpose To assess the diagnostic accuracy of magnetic resonance imaging (MRI) perfusion against perfusion single photon emission tomography (SPECT) screening for chronic thromboembolic pulmonary hypertension (CTEPH). Ventilation/perfusion (V/Q) scintigraphy is recommended to screen for suspected CTEPH. It has previously been shown that 3D dynamic contrast‐enhanced (DCE) lung perfusion MRI has a similar sensitivity for diagnosing CTEPH in comparison to planar perfusion scintigraphy; however, planar scintigraphy has now been largely replaced by SPECT, due to higher spatial resolution and sensitivity. Materials and Methods Consecutive patients with suspected CTEPH or unexplained pulmonary hypertension attending a referral center, who underwent lung DCE perfusion MRI at 1.5T, perfusion SPECT, and computed tomography pulmonary angiography (CTPA) within 14 days of right heart catheterization, from April 2013 to April 2014, were included. DCE‐MR, SPECT, and CTPA were independently analyzed by two blinded radiologists. Disagreements were corrected by consensus. The gold standard reference for the diagnosis of chronic thromboemboli was based on a review of multimodality imaging and clinical findings. Results In all, 74 patients with suspected CTEPH underwent all three modalities. Forty‐six were diagnosed with CTEPH (36) or chronic thromboembolic disease (CTED) (10). 3D DCE perfusion MRI correctly identified all patients (sensitivity of 100%), compared with a 97% sensitivity for SPECT. Conclusion DCE lung perfusion MRI has increased sensitivity when compared with perfusion scintigraphy in screening for CTEPH. As MRI does not use ionizing radiation, it should be considered as a first‐line imaging modality in suspected CTEPH. Level of Evidence: 3 Technical Efficacy: Stage 3 J. Magn. Reson. Imaging 2017;46:1693–1697.

C hronic thromboembolic pulmonary hypertension (CTEPH) is a potentially curable form of pulmonary hypertension (PH). 1 The diagnosis requires a mean pulmonary artery pressure (mPAP) 25 mmHg at right heart catheterization (RHC), in the presence of at least one segmental defect on perfusion imaging or filling defects on computed tomography pulmonary angiography (CTPA), after at least 3 months of effective anticoagulation. 2 The true incidence and prevalence of CTEPH is not known, but the cumulative incidence of CTEPH after survival from an acute pulmonary embolus is reported as 3.8% at 2 years. 3 The pathological process is thought to be due to incomplete lysis of the acute pulmonary embolus; the subsequent organization of the obstructing thrombus leading to obstruction of pulmonary vascular bed. 4 This ultimately leads to increased pulmonary arterial pressure, right ventricular dysfunction, and if untreated the prognosis is poor. 5 Patients with CTEPH usually have a history of either pulmonary embolism or deep venous thrombosis, although a significant proportion may present with unexplained breathlessness or pulmonary hypertension of unknown cause. 6,7 It is important that the diagnosis of CTEPH is made, as pulmonary endarterectomy is associated with increased survival and a favorable functional outcome in CTEPH. 1 The 2013 World Symposium on Pulmonary Hypertension recommended single photon emission computed tomography (SPECT) ventilation/ perfusion (V/Q) scintigraphy as the preferred screening test for CTEPH, 8 but this entails injection of 100 MBq of 99mTclabeled macroaggregated human albumin, resulting in exposure to ionizing radiation with an effective dose of 0.017 mSv/ MBq. 9 Cardiopulmonary magnetic resonance imaging (MRI) is emerging as an important tool for assessing the structure and function of the right ventricle in patients with PH, 10 and it has already been shown that 3D